16 May 2022

Austrian SYW Artillery

With this article, I will present the Seven Years’ War periods most celebrated artillery. The new fine ordnance fielded by the troops of her majesty, the Empress-Queen of Austria. It was universally regarded as the most modern artillery system of this period until the introduction of the Gribeauval ordnance in France during the 1770’s. It should be noted that the Liechtenstein M1753 ordnance served as the template for Gribeauval’s system, for he had been part of the team modernizing the Austrian artillery during his service in the Austrian artillery before and during the SYW.
Now, the Austrian guns are truly missing among the articles on this subject in my Blog. Its about time I set myself to work. Vivat Maria Theresia!

A few important remarks in advance
(My revised notes January 2022—most new content found with presenting the new M1752 6 & 12-pdr field gun):

Since starting this article earlier this year, I have been forwarded new source material from Vienna during this summer 2021. Apart from the Vienna Kriegsarchiv sourced manuscript by Franz Rubli, forwarded to me by Pavel Jurik from Czechia, I recieved considerable new informations from a gentleman in Austria, who happens to research precisely the same subject at present. He has surveyed a many drafts and texts found in the Vienna Kriegsarchiv, as well as an original set of drafts with its associated explanatory text signed by general Feuerstein dated 1752 found in the Liechtenstein Collections archive in Vienna.
The new information requires a revised dating for the guns I present with the below.
I now present the Austrian ordnance in its state of transition, illustrating the guns of the pre-1750 range, adopted with the Austrian systematisation of 1716/1722, its revised
systematisation or Regulation of 1737, and the new Liechtenstein ordnance introduced with the 15 April 1750 Regulation, as well as with the one of July 1752.  The new barrel design had received its fixation by 1750 and remained unaltered till the end of the SYW with only minor changes introduced with the Regulation of July 1752. They include the withdrawl of the 1750 Regulation 10-pdr howitzer in favor of a lighter 7-pdr howitzer, the lenghtening of the 12-pdr light battery gun from 18 calibres to 21, the introduction of a new trunnion shoulder design, as well as a minor change with the mouldings of the cascabel & button. More important was the introduction of new carriages with the 1752 Regulation. I do have drafts of the latter ones that are found in the papers of the Stuttgart Nicolai Collection, but I initially dated them into the 1770’s—well after the SYW—and therefore ignored them. Apparently, they had already been introduced before, hence, I will now also add the new 1752 carriages for the entire range of the new Austrian field- and battery cannon & howitzers. They will be presented as M1752, for an original 1753 Regulation does not exist. The ones found in the Kriegsarchiv have either a false dating, or refer to documents made only much later during the napoleonic period.  A many guns to the M1750 design presented below should have been fielded during the earlier campaigns of the SYW, nevertheless. Austria's ‘progamme’ of supplying the artillery with new lightened ordnance did not start in 1750, but already during the mid- to late 1740’s. The existing carriages found by 1752 were certainly not replaced, but took to the field in 1756. Also pre-1750 barrels of the sort Rubli presents were not re-cast to the new design but have seen service during the war until they were either lost or became unusable.
Meanwhile it could be verified that Rubli presents the range of new guns at around 1749 before the fixation of the new ordnance with the Regulation (Austrian: Verordnung) of 15 April 1750. The mouldings of his barrels have a different design and remain closer to the pattern adopted with the Regulation of 1737. Apparently they are the design of Giuseppe Solonati, in 1744 Feld-Maréchal Liechtenstein appointed him as inspector-general of the Austrian gun casting. Rublis carriages are also rather close to old pattern ones, and so are the carriages of the 1750 Regulation which all come with a pair of centre transoms. Now several changes were made with the carriages that found a general adoption with the Regulation of July 1752. A standard wheel diameter of 51.25 Vienna Zoll for all field guns was fixed and 54 Vienna Zoll for all battery guns. Apart from the 3-pdr, the axletree was placed considerably rearwards, and all guns except the 3-pdr and the heavy 24-pdr recieved an additional pair of trunnion sockets into which the barrel was placed for the march (Austrian: Marschlager).
Below find the M1752 3-pdr field gun on its new carriage.

Vienna Kriegsarchiv, signature: Memoires XIII/463-465; Franz Rubli.
Published with kind permission of the Österreichisches Staatsarchiv, department Kriegsarchiv at ka@oesta.gv.at


Rubli also presents a light wrought-iron 3-pdr "quick-fire" gun of the sort the Saxons fielded during this period. I have never seen this before. Nor was I aware this type of gun was ever fielded by the Austrians. Under the direction of Feld-Maréchal Wenzel von Liechtenstein—1744 appointed General Director of the Ordnance—Rubli is confirmed being part of the team selected to modernize the Austrian artillery. This makes it a most valuable and reliable primary source. However, by around 1751 he took service in the Hungarian town of Essegg (today Osijek, Croatia). He therefore ceased to be an eyewitness of the changes after he left Vienna. I can also draw from another primary source found in the Württembergische Landesbibliothek, Stuttart / Germany, as part of the so called Sammlung Nicolai (Nicolai Collection). According to Daniel Hohrath, curator of the Bavarian Army Museum, to his knowledge, this material has also never been used for academic research as well. It has several sheets with detailed tables and some drafts of the new Austrian ordnance presented in Vienna 15 April 1750—as per their caption.
These tables could meanwhile be verified as authentic Austrian.  Also a table with the dimensions of the 1752 Regulation carriages is found here wich has identical figures with a selection of tables found in the Vienna Kriegsarchiv that are now also availabe to me.
That being said, it is important to be aware that all nowadays available literature on the subject I know of entirely fail to do so.  This is probably due to the complete destruction of the old artillery archive in Vienna around 1770, and the thus resulting source situation in todays Vienna Kriegsarchiv. Only scattered papers of the period before 1770 are found. Many of the plans have been seperated from their asociated exlpanatory texts, which make their dating difficult. Existing complete sets of drafts with text exist in the form of the rare printed "Waffenlehre" publ. Vienna 1767, another set of drafts and texts by Carl Callot, the true designer of the new ordnance, that he presented to the Vienna Artillerie Commission after 1770, as they had no plans they could work on.  Now, meanwhile the material had undergone some remastering after the SYW and the range of the so entitled "Light Battery Guns" had been removed from service and are not seen on any tables listing the Austrian range of guns fielded during the SYW. The tables found present "short" and "long" 12-, 18-, and 24-pdr battery guns instead. Their entitlement identifies them as post SYW range, for the tables of the Regulation of 1750 as well as the near identical 1752 Regulation seperate between "light" and "heavy" battery guns only. These tables do not list 18-pdrs with the range of battery guns. As per the souces found in Vienna, the first 18-pdr construcion was tested only at around 1764. It was designed to replace the 18 calibre light 24-pdr battery gun.
With this article I will successively present the initial M1752 Lichtenstein Ordnance. It is the range of guns that saw service during the SYW.
A note on the caliber dimensions I am using, as they will deviate somewhat with figures found elsewhere. Thats because the figures found elsewhere are moreoften rounded figures for a catchier understanding. I wanted to arrive as close as possible to the true Liechtenstein system figures. As a result, I calculate all anew.
Liechtenstein’s constructors where working with the old accepted Nuremberg caliber dimensions, widly in use within the Holy Roman Empire then. Liechtenstein’s team felt compelled to stay with them in order to remain compatible with the ordnance fielded by the many Reichsarmee contingents at that time, as it is quoted from Rubli’s writings in an article on the true ‘Old-German’ Nuremberg artillery caliber system (Oestereichische militärische Zeitschrift, edition 1826, vol 2). Hence, the basic caliber for computing the diameter of all pieces was the diameter of 1 Pfund iron shot for cannons or stone for mortars and howitzers of the Nuremberg Artillerie-Fuss (29.3 cm) expressed in Vienna Zoll.
My employed figures are based on the fixation by the Slovenian 1754 born baron Jurij Vega (in Austrian service known as Gerog von Vega). An Austrian artillery officer & a reknown mathematician. From 1780 on, he was appointed director of the Mathematics Department of the Vienna Artillery School. His fixation—apparently dating well after 1780—being 1 Nuremberg Pfund iron shot has a diameter of Nuremberg 2.04 Zoll or Vienna 1.89 Zoll. Some embarassment is caused here because the Vienna foot scale received a universal fixation for the Habsburg Empire only with the patent of 1756. A gut feeling tells me Liechtenstein’s 1745 team started off with neat Nuremberg 2 Zoll iron—since 1 Nuremberg Pfund stone was neat 3 Zoll, but I dare not mess with this famous lector’s figures. A resulting minor deviation to the true Liechtenstein figures should not corrupt my display of the original 1752 introduced new guns.

Tabella denen metallenen Stücken an beigesetzten Gattungen so den 15ten Aprilis 1750 verfertigt worden in Wien [sic.]
Württembergische Landesbibliothek Stuttgart / Nicolai Collection).

The 15 April 1750 presented and approved range of the new bronze cannon:
a so entitled range of Field Guns:
– 3-pdr field gun, 16 calibres,
a reduced metal strength Regiments-Stück
– 6-pdr field gun, 16 calibres,
a reduced metal strength 1/8 cannon
– 12-pdr field gun, 16 calibres,
a reduced metal strength quarter-cannon
a range of so entitled Light Battery Guns:
– 12-pdr light battery gun, 18 calibres,
a reduced metal strength quarter-cannon
– 24-pdr light battery gun, 18 calibres,
a reduced metal strength half-cannon
a range of so entitled Heavy Battery Guns:
– 12-pdr heavy battery gun, 27 calibres, quarter-cannon
– 24-pdr heavy battery gun, 23 calibres, half-cannon
Note: Note: the only difference between the 1750 Regulation range of ordnance to the one of 1752 is the replacement of the howitzer. The 1750 Reg. accounts for a 10-pdr construction which had been put on hold in favour of a 7-pdr construction with the Reg. of 1752. Another change is found in the explanatory text of the 1752 Reg. found at the Vienna Liechtenstein Archive that mentions the 18 calibre light battery 12-pdr should be made 3 calibres longer, now arriving at 21 calibre barrel length. All 18-pdrs fielded during the SYW as part of a siege train were of the old 1722 or revised 1737 regulation ordnance. A gun entitled Notschlange (culverin) with a barrel of 29 calibers bore length. Much of this older ordnance would be found among the siege guns or in fortifications during the war, being replaced by the new heavy battery guns only in case of want. The letter pretty much remained unchanged dimension-wise and weight-wise, except for the barrels garnishing elements or mouldings.
I will also illustrate the two non-regulation constructions which Rubli presents in addition to the new Liechtenstein ordnance. It’s a 2-pdr double-culverin, 30 calibers long, and this wrought-iron 3-pdr quick-fire gun that I mentioned afore.

Vienna Kriegsarchiv, signature: Memoires XIII/463-465; Franz Rubli.
Published with kind permission of the Österreichisches Staatsarchiv, department Kriegsarchiv at ka@oesta.gv.at

I believe these two pieces of the old range of guns were still in service at around 1750. Why else would Rubli bother to present them? In fact Horace St. Pauls journal notes the artillery park of the Austrian army at the battle of Prague 6 May 1757 included 24 non-regulation 2-pounders of the old ordnance!

The next piece is the new 6-pounder field gun on its new M1752 carriage: 

Below see an original set of drafts from the Stuttgart Nicolai collection illustrating the M1752 barrel and carriage bracket cheek. The lower one comes with the applied figures and dimensions for the 6-pdr carriage. 

source: Nicolai Collection artillery folders, Württembergische Landesbibliothek, Stuttgart / Germany
I will continue to peresent also the older M1750 barrels and carriages, as I believe they also saw service during the SYW—especially the barrels continued to be cast with the M1750 mouldings till around 1770, as many original barrels on display at the Vienna Army Museum reveal. In addition, it also sheds some light on the evolution of Austrian gun design starting at around 1744. The 6-pounder Rubli presents is the pre 1750 model, that should have seen service during the War of Austrian Succession fom 1747 on, or even earlier. 

Below see the original Rubli sheet for the pre 1750 6-pounder:
Vienna Kriegsarchiv, signature: Memoires XIII/463-465; Franz Rubli.
Published with kind permission of the Österreichisches Staatsarchiv, department Kriegsarchiv at ka@oesta.gv.at
Interesting with this illustration is Rubli’s presentation of the complete team of learned gunners serving the piece just as it is specified in the 1757 Reglement für das gesammte Kaiserlich Königliche Feld-Artillerie-Corps. Since the gunners already wear the new uniform, which is said, has been inroduced only by 1750, his illustraded draft should be dated to around this time. The gunners should be from the Haus-Artillerie Corps—i.e. invalids serving in Vienna, rather then gunners from the Field Artillery Corps.  The gunner serving as gun commander is seen laying the piece. He held the rank of a Stück-Korporal. He was also the one in charge for placing the fuze into the touch hole. One gunner has its position at the trail employing the trail spike to assist in laying the piece. One gunner serving as firer, and on the most left we see the gunner with the sponge in charge for whiping and ramming the cartrige down the barrel. On his right is the gunner in charge for placing the cartige into the muzzle, while the gunner in the background is the one in charge to supply new rounds from the ammunition box or the guns associated ammunition cart located in some distance to the rear of the gun. The team for all field guns was the same—i.e. the new 3-, 6-, & 12-pounders. Only the number of Handlangers changed in size. The 7-pounder field howitzer had a team of 6 Büchsenmeisters and 1 Jung-Feuerwerker (NCO rank) or a total of 7 learned gunners.
Below see the draft of the 6-pounder including limber illustrating the carriage with all its gear and iron fittings by around 1775:

source: Scharnhorst, Handbuch der Artillerie, vol i, edition Hannover 1804
It has often been used as template to illustrate the SYW model. However, this gun would look authentic if seen on the battlefields of Marengo and Austerlitz, but certainly not at Kolin or Lobositz. Note, this cariage has no additional Marschlager. I don’t know at what time the Marschlager was omitted for the 6-pounder—possibly well before 1767. The ammunition chest has been placed onto the limber, introduced only after the death of prince Liechtenstein in 1772. The wheels of the limber come with 6 felly elements and 12 spokes, which is an error. The M1752 limber wheels as well as the small wheels for the ammunition wagons had 5 felly elements and only 10 spokes. A contemporay illustrated manual for the 3-pounder, dating to around 1775, found at the Vienna Army Museum confirms it.
Below I now present the M1752 12-pounder on its new carriage:
Below see 3 original 12-pounder barrels on display at the Vienna Army Museum:
Image courtesy Vienna Heeresgeschichtliches Museum HGM, Austria

This barrel cast 1761 in the Habsburg Netherlands foundry of Mecheln comes with the 1752 Regulation trunnion shoulder design, but also with the 1750 Regulation pine cone shaped button instead of the 1752 Regulation flattened sphere design. It weighs 1,369 Vienna Pfund or 768 kg, which is a close match to the barrels nominal weight of 1,344 Pfund. Another such M1750 barrel cast in 1768 at the Mecheln foundry you can see below: 
Image courtesy Vienna Heeresgeschichtliches Museum HGM, Austria

This one has the trunnion shoulders as well as the button in a variant of the 1750 Regulation, rather then those of the 1752 mouldings. The draft is dated 1765 and found at the Vienna Kriegsarchiv. Its the draft of the 18 calibres Light Battery 24-pdr presented by Wenzel von Callot in Mecheln / Habsburg Netherlands. Also note the variant with the barrels insignia. On the chase, it has the arms of prince Charles de Lorraine, stadholder or govenor of the Habsburg Netherlands, as well as another coat of arms that I was unable to identify. The Habsburg Netherlands department of the Austrian artillery retained a somewhat independent status within the corps and was not subordinate to the command of prince Liechtenstein. Sidenote: the barrel in the background is an Austrian M1716/1722 3-pdr, 28 calibres or 200.5 cm long—longer then the Liechtenstein 12-pdr! Its a 1720 cast of the Austrian gun foundry in Milan/Italy. Also see a somewhat special designed 12-pdr barrel cast in Vienna in 1767:  
Image courtesy Vienna Heeresgeschichtliches Museum HGM, Austria

  This one has the 1752 Regulation mouldings but comes with a rather massive non regulation muzzle swell. The ring accounting for a width of 18/32 instead of the Regulation 12/32. Also the dolphins remain not sculptured. Other barrels on display in Vienna and cast at later dates still continue to have the dolphins sculptored as Pratzen.

To complete the 1752 Regulation range of new light field guns, I now present the M1752 7-pounder "Howitzer". This piece replaced the M1750 10-pounder howitzer, which was removed from the range of the regulation ordnance in 1752. However, it is believed it has been added to the range again sometimes during the SYW, since Gribeauval states in his March 1762 report to the French Minister of War, that Austrians fielded 7- and 10-pounder howitzers. The other Austrian howitzer designs in use during the SYW I will present further below along with the range of battery guns.

Original barrel on display at the Vienna Heeresgeschichtliches Museum

From 1759 on, also a number of 24-pounders start to appear with the tables of guns fielded with the artillery train of the field army. A total of 6 in 1759, 8 in 1760, and 6 again in 1761 and 1762.
According to Gribeauval’s report of March 1762, it was captured Prussian guns. This piece can be identified as the M1744 super-light Holtzmann 24-pounder presented with the below draft.

Gribeauval writes: « On a mené par complaisance quelques pièces de 24 prises sur l’ennemy; c’etoint des espèces d’obuziers qui étoint sans solidité, sans portée et sans justesse; elles entraînoint une suite énorme de caissons. L’atrillerie a toujours protesté contre; elles n’ont jamais produit aucun bon effet; cependant elles ont été soutenues pendant deux campagnes par les calmeurs des admirateurs des productions prussiens [sic.]. »
Transl: For reasons of complacency, we also have some 24-pounders taken from the enemy; their design resembles that of howitzers; they are without solidity, without range, and without accuracy; they require an enormous number of ammunition wagons. The artillerie corps always rejected them; they never produce any good effect; however the artillery corps opposition had been calmed during two campaigns by our admirers of designs “made in Prussia”. These guns had a 6 horse draught and were served by the same number of learned gunners plus Handlangers as the 12-pdr field guns. This bit being found in the tables of: Beiträge zur Geschichte des österreichischen Heerwesens, part 1: Period of 1757—1814 with particular attention to Organization, Supply, Tactics; Vienna 1872.

Now we come the range of the so entitled “Leichten Batterie-Stücke” (Light Battery Guns). This range, along with the field guns is to be regarded as the genuine new creation of Austrian gun design under the direction of Liechtenstein from 1744 on. The first designs should have been fielded already at around 1745 during the War of Austrian Succession. It is the guns Rubli presents with his manuscript. The other range of Austrian battery guns were entitled “Schwere Batterie-Stücke” (Heavy Battery Guns). The figures for this branches designs of the 1750 and 1752 Regulations reveal, that their dimensions remaind mostly unaltered to the old pattern guns in use since 1716/1722.

Below see Rubli's original illustration of this guns barrel fixed into the rearwards Marsch-Lager and limbered for the march.

Vienna Kriegsarchiv, signature: Memoires XIII/463-465; Franz Rubli.
Published with kind permission of the Österreichisches Staatsarchiv, department Kriegsarchiv at ka@oesta.gv.at

With the next sheets I present the other howitzers in use during the SYW. The 12-pounder howitzer design, identified as M1737 and the original heavier M1716/1722 regulation pieces were still in use during the SYW and later until they were eventually removed from the inventory during the 1780’s. According to the 1757 campaign journal of Horace St. Paul, 6 such old pattern 12-pdr howitzers took part in the bombardment of Zittau, reducing this unfortunate city to ashes. With near certainty they were also employed with the siege of Schweidnitz/Silesia and in the batteries raised to cover the crossings of the Lohe river with the battle of Breslau the same year. (See: Cogswell, Neil, Lobositz to Leuthen. Horace St Paul and the Campaigns of the Austrian Army in the Seven Years War 1756-57). 

Original draft of the 12–pdr howitzer believed M1737. Source: Württembergische Landesbibliothek/Stuttgart, Germany – Sammlung Nicolai  

With the below sheet, see the new M1752 field and light battery cannons arranged on a single sheet in same scale.

The next range of Austrian ordnance are the Heavy Battery Guns or "Schwere Batterie-Sücke" as per their official Austrian 1752 designation.  It was a 24- and 12-pdr design.

Original 1750 cast 24-pdr barrel on display at the Vienna Heeresgeschichtliches Museum (HGM)

I am pleased to be able to present an original M1750 barrel with this article.  It confirms that the 1750 designed ordnance wasn't produced for testing only, but serial casts commenced right away, as this gun was cast in the foundry of Budapest, while all the new guns for testing purposes would have been cast in Vienna, only.  The two other barrels seen behind the rather stylish roccoco 1750 cast 24-pdr are M1716/1722 24–pdrs of the old pattern.  This gun deserves a closer observation, as it should have been found in service during the SYW. I present it with the below sheets.

I did not bother to do an illustration ot the M1750 barrel mounted on its M1750 carriage.  It was basically the same as the one Rubli illustrates. 
Original M1716/1722 24-pdr barrel on display at the Vienna Heeresgeschichtliches Museum (HGM)

Below see another sheet by Frantz Rubli where he demonstrates that the new 18 calibres barrel 24-pdr Light Battery Gun, if mounted on a ship or rampart carriage, reaches as far into the embrasure as the old pattern heavy 1/2 Carthaune mounted on its custom ‘travelling’ carriage (using this periods English denomination here).
Vienna Kriegsarchiv, signature: Memoires XIII/463-465; Franz Rubli.
Published with kind permission of the Österreichisches Staatsarchiv, department Kriegsarchiv at ka@oesta.gv.at

This piece is a M1716/1722 barrel—easy to identify by its eagle designed cascabel and button.  As mentioned afore, this old pattern carriages bracket cheeks are about 42 calibres long, instead of Rubli’s 32.  The wheels arrive at 64.5 Vienna Zoll or near 170 cm diameter, just like the wheel Rubli recommends with his documented 1737 design.  Its total weight including the barrel arrives at 8,946 Vienna Pfund or 5,021 kg while the new light 24-pdr structure weighs no more then 3,550 Vienna Pfund or 1,992.5 kg, as Rubli writes in the accociated captures on this sheet.  His
illustrated wooden parts of the heavy 24-pdr carriage are coloured near black.  I believe he illustrated an older more weathered carriage that has received a furnishing treatment with tar in addition to its initial linseed oil treatment.  His other ‘new’ carriages for his new ordnance guns are all illustrated in a much lighter shade of wood brown—i.e. treated with linseed oil furnish only.  Somewhat irritating remains his take of the bronze for the barrels.  It looks like plain copper, not bronze.  Possibly his palette of colours may have lacked sufficient yellow. We don’t know.
Below see also two images of an origninal 1643 manufactured carriage on display at Forchtenstein castle, Burgenland / Austria, as part of the extensive Estherhàzy Armory Collection exhibited here.  As said with the afore, it already includes many details seen with the carriages Rubli presents a 100 years later.  As far as I can recollect, its the carriage of a 12-pdr.  Note the long top face of the bracket cheek from the trunnion cutouts to the bow or angle.  It indicates that the carriage mounted a long barrel of around 30 calibres length, or even longer.  Please excuse the poor quality of the photos.  This piece is on display inside the castles gateway to the inner castle.  It was pitch dark here.
Original carriage on display at Forchtenstein Castle, Burgenland / Austria at

Original carriage on display at Forchtenstein Castle, Burgenland / Austria at

This article is to be continued…

31 January 2019

British SYW Artillery

This is now the start of my earlier expressed intention to arrage a number of scale drawings illustrating British ordnance fielded during the War of Austrian Succession & Seven Years’ War period. I hope to manage presenting a number of pieces, by focusing on the heavier position guns that saw service in the WAS campaigns in Flandres & Germany, as well as with the British contingent of Prince Ferdinand of Brunswicks’ Allied Army in Germany 1758 through 1762.
The light 6 pounder battalion gun will likely to be the last piece to present, for many illustrations are available already & also many original and replique pieces exist to the present day. Hence, this one is well known.
Identifying the heavier position guns recommended for Field Service from the gentlemen of his British Majesties’ Royal Board Of Ordnance will be more of a challange.
John Armstrong, appointed Surveyor-General of the Ordnance (1722–1742) designed 3 ranges of ordnance during the 1730’s that were fixed in what I understand to be his 1736 Regulation. It should mark the starting point for all gun constructions up to 1762. Here, general Armstrong specified the basic construction principles for a Heavy, Medium, & Light range of guns. This 1736 Regulation by itself would already result in a wide range of different pieces. But even worse, it appears to have been employed as no more then a loose guide line, for I already found quite a few pieces that are clearly offside the 1736 Regulation figures when looking at the barrel weigths. A mass calculation of the sort John Muller provides in his “A Treatise of Artillery” on p. 49-50 of the 1768 edition has now become an important tool with my search to find the right constructions. Anyone who wants to try good fun mathematics for himself—watch out for the typo on page 50. A cubic foot of gun metal weighs 549 pounds, not 459! See page 3 in the same book. Took me a while, till I found the annoying error here.
My first arranged sheet illustrates the Armstrong 1736 Regulation heavy 12-pounder battery or battering gun

I continue to believe the cannon seen in David Morier’s painting can really be identified as an authentic piece from among the range of ordnance fielded during this period. 
By placing the Cannonier from the Morier painting next to my 12-pounder barrel, it is obviously too large a construction. The diameter of the base ring is certainly bigger than that of the cannon seen in Morier’s painting. Another heavy range 12-pounder construction—a barrel 7 foot 6 or 8 inch long—would arrive at about the same diameter. Somewhat slimmer was the 6 foot 7 inch Armstrong construction of his Medium range of ordnance. But this barrel would be too short. We clearly see a long barrel here. The only piece left would be the ‘Long 6’ with a barrel 8 foot long. Here it is. 
Now lets have a closer look. For a quick check, I needn't bother to draw its carriage. It already exists. John Muller provides the illustration, presenting it as the type of carriage that was in use by the time of his books 1st edition in 1757.

Now this seems to make a charming match. I believe the piece we see in Morier’s painting is with near certainty the 8 foot heavy 6-pounder. The Imperial & Allied Army’s Order of Battle for the year 1747 lists 26 3-pounders for 14 British battalions—possibly mounted on ‘Galloper’ carriages, 27 6-pounders of which a number must have been of the light 4.5 foot construction. John Muller mentions in his book that such a piece, employed at the battle of Laufeldt July 1747, was testet at Woolwich in the early 1750’s. The guns seen in the painting must be more then a dozen heavy pieces, but only 6 British 12-pounders were fielded that year. Hence, a many of the big guns we see here must have been ‘Long 6’ guns.
The piece also seems to have seen service in the Seven Years' War. With the commencement of the 1761 summer campaign, Prince Ferdinand's staff papers have a detailed record of the British artillery. Apart from the British line artillery brigades consisting of ‘Light’ 6 & 12-pounders along with some 5.5 inch howitzers, there had also been 3 heavy brigades of the artillery park. 8 ‘Heavy’ 12-pounders, 8 ‘Medium’ 12-pounders (the ones that were at Minden 1759 with a 7-horse draught), & 8 ‘Heavy’ 6-pounders. The ‘Medium’ 12 & ‘Heavy’ 6-pounders reinforced Granby's hard pressed division July 15-16 on the Dinker-Berg in the battle of Vellinghausen.
Earlier this summer I researched this battle in more detail together with Charles Grant, as he is writing on his next volume of his "Wargaming in History" series. We had a wonderful time here. Charles provided me with the following interesting bit. Its from Walter Evelyn Manners, "Some account of the military, political, and social life of the Right Hon. John Manners, marquis of Granby", 1899. Loosely quoting: The Scottish officer "Sir James Innes Norcliffe observed a ‘serjeant’ of Campell's Highlanders serving a ‘Long 6’ which the serjeant had carefully masked with boughs. The Highlander surveyed the effects of his excellent practice, ejaculating: Now a round !—Now a grape ! at intervals, as he varied his load." It must have been the severe cannonade in the early morning 16 July. Gun crew killed or disabled. The couragious Highlander served the piece instead. Sir James added that after the action he noticed grape-shot sticking in some of the dead Frenchmen like grains of Indian corn in the cob, and the round-shot had occasionally taken two or three of the enemy in a line. It is speculated if it was the Highlanders piece which wrought such havoc among the French [high] aristocracy, for 3 generals—all related—were killed with a single round very near Vellinghausen. That's where James Innes must have had its battle position as there used to be a ground feature on the slope of the Dinker-Berg facing towards Vellinghausen, that has been known among the locals as "Sir James Innes" since the days of the battle. Now it is gone. It was a fold in the ground with much the character of a sunken road. A natural trench much like the Bloody Lane at the Antiedam battle of the American Civil War.
Now back to the subject. There have been other 6-pounder constructions. The 1754 Regulation lists a 5 foot 1 inch piece—that’s only 7 inches or two shot diameters longer then the 4.5 foot Light 6-pounder battalilon gun. I wouldn’t entitle a 5 foot 1 barrel a ‘Long 6’, but I might be wrong here.
Since the death of John Armstrong 1742, and well into the 1750’s, the gentlemen in Woolwich tested a great number of various designs to find the best length & metal strength for its gun constructions. The 1754 Regulation shows the ones that seem to have been accepted for service in the field. The question remains: how many of the new pieces would have been cast to be fielded in the SYW? Possibly not all that many as milord Sackville had difficulties finding enough light guns with no more then a 6 horse draught earlier in 1759. Possibly those old 8 foot 6-pounders—tested in Flandres in the preceeding war—had to be fielded for lack of alternative in 1761. 

Below see my scale drawing of the "Long Six" along with all the essential data found to it.

I believe this is the very piece that is seen in the David Morier painting's right foreground. After doing this 6-pounder I decided to do the entire range of the M1736 heavy Armstrong pieces. Below see the heavy 3-pounder. 

Next comes the 24 pounder. 
Finally, the heavy 12 pounder. 
The afore 4 pieces had been the mainstay of the British artillery during the 1740's. (There is also mention of a heavy 9 pounder fielded in Flandres in 1747. I did not bother to do this piece. It was a 9 foot barrel, like the 12 pounder & apparently became obsolete by around 1750).  Only few new models started to arrive during this period. The new light 6 pounder by around 1745 with the War of the Highland Rebellion and a light & medium 12 pounder construction by the time of the Seven Years' War. I believe that is all there is.

The next piece I present here is the ‘medium’ 12-pounder—fielded from the mid 1750's on, no earlier to my understanding.
An original barrel—a cast of 1760—is on display in the US Watervliet Arsenal Museum, New York Sate. See images of this piece below.

British  Armstrong design ‘medium’ 12-pounder
image published here with kind permission of Bill Maloney http://www.williammaloney.com
The barrel's 1st reinforce has the Royal Arms of His Majesty
image published here with kind permission of Bill Maloney
The barrel's chase has the arms of John, 1st Earl Ligonier,
General-Master of the Ordnance 1759-1763
image published here with kind permission of Bill Maloney
Front view of the ‘medium’ 12-pounder
image published here with kind permission of Bill Maloney
Here is my draft of the piece along with all the data discussing its identification.


Finally, with the below 2 sheets, I present the two models of the Armstrong design ‘light’ range of ordnance fielded during the Seven Years' War in Germany—the light 6 also being fielded during the 1747-1748 campaigns in Flandres during the War of Austrian Succession. 


Below see the complete contemporary draft of the British light 6-pounder piece originating from the digital archive of the Germanisches National Museum, Germany, with its carriage including the lockers & its associated limber.