This is related to the previous discussion of the "SNY" marked 6-pounder bronze field gun, which I termed "pattern unknown."
After a few days in the National Archives this week, I have enough information to give the pattern a better name. I think it should be called "6 Pounder Brass Gun, Old Pattern." This more or less complies with the terminology used to record it in various ledgers found in the Archives.
The ledger pages linked below are from National Archives, Washington DC Record Group 156, Entry 100, for the period "Third Quarter 1844." Most of the ledgers in this entry do not have quite as many columns (models) of cannon as this one. Apparently the clerk or scribe who prepared these pages had reports from various locations, including at least Fort Moultrie, SC, including cannons described as "6 Pdr. Brass, Old Pattern" (abbreviated "O.P." as opposed to "N.P." for new pattern.) The "New Pattern" 6-Pounder would most likely (in 1844) have been the M1841.
Based on a number of other documents, some of which are shown in the previous discussion, I'm convinced guns of this model were purchased by the U.S. beginning in March 1812, and were widely dispersed in various forts and arsenals. There were always far fewer of these "brass" 6-pounders than there were of the less-costly "official models" of iron 6-pounders, but the records show many instances of both "brass" and iron 6-pounders having been present simultaneously at the same fort.
What I'm still lacking is any record of either the March 1812 contract, or the follow-on contracts mentioned in various sources. If anyone can provide citations, I'd greatly appreciate it. I've looked through the first two volumes of RG156, Entry 78, containing ordnance contracts, but it seems to begin in about 1816 and has no contracts for these early bronze guns.
The basic measurements of the "SNY"-marked example of the previous discussion are:
Nominal length: 48.4 in.
Total length: 55.8 in.
Weight, marked "5-3-09" (653 lbs.)
Basering diameter: 10.5 in.
Bore length: 45.13 in.
Present bore diameter, measured horizontally: 3.82 in.
The bore diameter at muzzle would have been nominally 3.67 in. for a new gun. The worn condition indicates the gun has fired something like 800 rounds, judging from Lt. Bell's test reports of 1827-8.
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