Signal gun or failed experiment?

MacCathain · 18th July 2017, 06:18 PM

I acquired this piece several years ago and, while it is outside my usual interests, I found it compelling enough to add to the collection. I'm hoping some of the gunnery experts on this forum can tell me what it is. I presume it's a signal gun but, for all that I know, it could be a DIYer's failed attempt at barrel casting.

It measures 16 inches from cascabel (button) to mouth and has a 1-inch diameter bore, which has been sleeved with ferrous metal (iron, steel?) reducing the bore diameter to 13/16". The bore length is 12 inches. The width at the outer ends of the trunnions is 7 1/4", while the width of the barrel at its widest is 3". The gun weighs approximately 22 pounds. There appears to be a vent on the top side (highlighted with a red circle in the image provided), which is filled with sediment. The gun bears no discernable stamps or marks.

The seller told me he had recovered the gun in 1949 from the bottom of a navigable Midwestern US river where shipping was known to have been active from the early 1800s. At the time I acquired it, I did some low-level research about the the decay of bronze artifacts subjected to fresh water immersion and, IIRC, it seems there is some basis to think the pin holes that cover the gun are the result of immersion for many years (the river in question is known for its high tannin content). As seen in the photos, the metal is heavily patinated.

I'm happy to shoot additional photos or answer any questions you may have. Thanks in advance.

M ELEY · 22nd July 2017, 08:47 PM

Very nice piece! No expert here, but from the pics, it appears to be a legit cannon of small bore, probably early/mid-19th c. Despite its small size, it might still fit into the swivel gun category. Are the trunions located mid-barrel, or closer to the 'bottom' of the piece on one side to allow for sharp angling? In Gilkerson's 'Boarders Away II', there's a small 16" piece with 3/4" bore that is a true swivel/rail gun. I'll wait to see what those more knowledgeable have to say.

MacCathain · 22nd July 2017, 09:48 PM

Thanks for your reply. The trunnions are placed approximately mid-barrel, but . . .

. . . I discovered that the bottom of the barrel has additional reinforcement (thickness) in the area shown by the red box in the attached image. This "pad" slopes from the rear of the barrel to the front, where it abruptly stops, forming a well-defined edge (indicated by the yellow line). The highest point on this edge stands about 1/8" proud of the rest of the barrel.

I can't imagine what purpose this served other than reinforcement, but then you would think it would have been all the way around the barrel, not just a small pad on the bottom.

Maybe the sloped pad was part of the elevation mechanism, which I assume would have been little more than a wedge that moved fore and aft on the pad to raise or lower the barrel.

M ELEY · 24th July 2017, 03:20 PM

Very interesting! es, it does does sound like it was cast in this way to direct the barrel in an upwards direction. With the trunnions being level and this thickened bottom reinforcement to slant the barrel upwards, I'm leaning towards a signal gun. Again, little more than a novice here. I was hoping some others might still come in on this one with their opinions.

Rick · 24th July 2017, 03:57 PM

Mr. Google seems to imply that cannon were not unusual on flatboats and keelboats; probably to deter Indian attacks and or river pirates.
The lining may have been inserted due to the brass becoming 'honeycombed' with age and use.

Battara · 27th July 2017, 05:24 AM

There are a lot of Southeast Asian cannon that are being made today with inserts like this but are being sold as old.

I wonder if this is a recent make, due to this and the holes I see on the outside, as well as the touch hole that is too crisp around the edges.

These are my musings.

18th July 2017, 06:18 PM	#1
MacCathain Member Join Date: Apr 2017 Posts: 66	Signal gun or failed experiment? I acquired this piece several years ago and, while it is outside my usual interests, I found it compelling enough to add to the collection. I'm hoping some of the gunnery experts on this forum can tell me what it is. I presume it's a signal gun but, for all that I know, it could be a DIYer's failed attempt at barrel casting. It measures 16 inches from cascabel (button) to mouth and has a 1-inch diameter bore, which has been sleeved with ferrous metal (iron, steel?) reducing the bore diameter to 13/16". The bore length is 12 inches. The width at the outer ends of the trunnions is 7 1/4", while the width of the barrel at its widest is 3". The gun weighs approximately 22 pounds. There appears to be a vent on the top side (highlighted with a red circle in the image provided), which is filled with sediment. The gun bears no discernable stamps or marks. The seller told me he had recovered the gun in 1949 from the bottom of a navigable Midwestern US river where shipping was known to have been active from the early 1800s. At the time I acquired it, I did some low-level research about the the decay of bronze artifacts subjected to fresh water immersion and, IIRC, it seems there is some basis to think the pin holes that cover the gun are the result of immersion for many years (the river in question is known for its high tannin content). As seen in the photos, the metal is heavily patinated. I'm happy to shoot additional photos or answer any questions you may have. Thanks in advance. Attached Images

22nd July 2017, 09:48 PM	#3
MacCathain Member Join Date: Apr 2017 Posts: 66	Thanks for your reply. The trunnions are placed approximately mid-barrel, but . . . . . . I discovered that the bottom of the barrel has additional reinforcement (thickness) in the area shown by the red box in the attached image. This "pad" slopes from the rear of the barrel to the front, where it abruptly stops, forming a well-defined edge (indicated by the yellow line). The highest point on this edge stands about 1/8" proud of the rest of the barrel. I can't imagine what purpose this served other than reinforcement, but then you would think it would have been all the way around the barrel, not just a small pad on the bottom. Maybe the sloped pad was part of the elevation mechanism, which I assume would have been little more than a wedge that moved fore and aft on the pad to raise or lower the barrel. Attached Images

22nd July 2017, 08:47 PM	#2
M ELEY Member Join Date: Dec 2004 Location: NC, U.S.A. Posts: 2,066	Very nice piece! No expert here, but from the pics, it appears to be a legit cannon of small bore, probably early/mid-19th c. Despite its small size, it might still fit into the swivel gun category. Are the trunions located mid-barrel, or closer to the 'bottom' of the piece on one side to allow for sharp angling? In Gilkerson's 'Boarders Away II', there's a small 16" piece with 3/4" bore that is a true swivel/rail gun. I'll wait to see what those more knowledgeable have to say.

24th July 2017, 03:20 PM	#4
M ELEY Member Join Date: Dec 2004 Location: NC, U.S.A. Posts: 2,066	Very interesting! es, it does does sound like it was cast in this way to direct the barrel in an upwards direction. With the trunnions being level and this thickened bottom reinforcement to slant the barrel upwards, I'm leaning towards a signal gun. Again, little more than a novice here. I was hoping some others might still come in on this one with their opinions.

24th July 2017, 03:57 PM	#5
Rick Vikingsword Staff Join Date: Nov 2004 Posts: 6,262	Mr. Google seems to imply that cannon were not unusual on flatboats and keelboats; probably to deter Indian attacks and or river pirates. The lining may have been inserted due to the brass becoming 'honeycombed' with age and use.

27th July 2017, 05:24 AM	#6
Battara EAAF Staff Join Date: Dec 2004 Location: Louisville, KY Posts: 7,139	There are a lot of Southeast Asian cannon that are being made today with inserts like this but are being sold as old. I wonder if this is a recent make, due to this and the holes I see on the outside, as well as the touch hole that is too crisp around the edges. These are my musings.