romeo-1
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This one seems to come with a very good provenance: » Coll?s big shot The Ambulist
Romeo-1, thank you for the additional photo. With respect, I have to say your find is still not from a Bar-Shot. Besides having a round-bodied projection, the projection is too thick in relation to the diameter of the disc. The bar of an actual Bar-Shot was always much thinner than the ends of the Bar-Shot. There was an extremely important reason for that.
Explanation:
Prior to significant advances at the start of the mid-1800s, the science-&-art of casting "large" metal objects such as cannons was still very elementary and crude. Large solid-cast metal objects very frequently contained internal casting-flaws such as airbubbles and concentrations of impurities... which had the effect of making the cast metal "brittle." Meaning, the cast metal tended to shatter when sudden strong force was applied to it -- such as, firing the large gunpowder charge needed to propel a solid iron ball for half-a-mile or more. Colonial Era army and navy battle reports frequently contain incidents of cannons exploding upon firing, with disastrous results for the cannon's crew and even the ship itself. (An exploding cannon could cause a nearby ammo-magazine to also explode.)
Therefore, the army and navy Ordnance Department was always extremely concerned about "overloading" a cannon with a projectile that was too heavy for it to fire safely. The heavier the projectile, the greater the amount of internal stress on the cannon's barrel when it was fired. In the Colonial Era, the weight safety-limit for a cannon's projectiles was approximately 1.5 times the weight of the Solid-Shot cannonball it was intended to fire. That is why typical Bar-Shots had a hemisphere (half-ball) on each end, instead of two whole balls. You absolutely did not want to risk disaster by firing a projectile which weighed twice as much as a single Solid-Shot cannonball for the cannon you were using.
Also, the bar was kept narrow, so it would weigh less, instead of being (needlessly) thick like you see in some of the photos of so-called Bar-Shot you posted.
In my professional opinion as a multi-published scholar on the subject of Historical Artillery, about half of the objects in the photos you posted are not Bar-Shot projectiles... for several logical "tactical" and "structural" reasons.
Tactical:
As you may have noticed in the photo I posted showing an actual Bar-Shot recovered from inside a cannon on a RevWar shipwreck, its length is at least 3.5 times its diameter. You wanted that much length so that the spinning/tumbling Bar-Shot would create a wide path of destruction through an enemy ships spars, rigging, and sails. That is why the British Navy came up with the "expanding bar-shot" shown as #18 in one of the photos... and why that photo shows two examples connected by extra-long chainlinks. The objects in the photo which are connected by a short bar would create "significantly" more damage than a single ball.
Structural:
1- As mentioned above, to avoid overstressing the cannon's barrel, the bar was kept thin to avoid needlessly increasing the Bar-Shot's weight. On several objects in the photos, the bar is round-bodied and needlessly thick.
2- The shape of the bar (round or square-bodied) has no effect on the Bar-Shot's destructiveness. Much more blacksmith-labor (hammering) is required to create a smoothly round bar than a simple square-bodied one. Why put the extra labor into making the bar smoothly round when that makes no difference in a Bar-Shot's performance? You'd only do the extra labor if the bar needed to be neatly round.
3- Related to the extra labor required to create a "complicated" shape... the ends of some of the objects in the photos are shaped like a doorknob. Why spend the additional labor needed to create that "complicated" shape when it has no performance-advantage over a simple cast hemisphere?
4- Speaking of "a simple cast hemisphere"... actual Bar-Shot always consisted of cast-iron ends attached to a wrought-iron bar. That construction was necessary due to the brittleness of cast-iron. The enormous firing-blast stress would tend to break a cast-iron connection between the bar's ends. So, no actual Bar-Shot were manufactured as a "single-unit" of cast-iron.
5- In the photo you posted showing an object next to a tape-measure, you'll notice that the ends are approximately 2 inches in diameter. That is too small for effectiveness as a Bar-Shot -- whose purpose was to cause serious damage to an enemy ship's mast, spars, and rigging. Bar-Shot was not made as an antipersonnel projectile. Yes, it would kill people if you could manage to skip it along an enemy ship's deck... but the decks were protected by thick "gunwales" (walls) -- which this small object would not penetrate.
As I've mentioned in other posts, a key part of correctly determining whether a ball is a cannonball or not is to see whether its precisely-measured diameter matches up with any of the known calibers of "antique" (muzzleloading) cannons. Such cannons whose bore-diameter was less than 3 inches were useless against warships. Yes, you could put a hole in a small boat's hull with a 2-Pounder (2" bore-diameter) cannon... but you didn't need a Bar-Shot to do that.
Unfortunately, it's clear that most archeologists (and even shipwreck archeologists) are not well-educated experts about historical artillery projectiles. Therefore, they have a tendency to incorrectly identify various objects as being artillery projectiles simply because it "looks like" an artillery projectile. Those guys are well-intended, but they simply do not know the information I've given you in this post. They are deeply educated about civilian artifacts, and sometimes about soldiers/sailors equipment... but not about correctly identifying artillery projectiles. For example, in my experiences of communicating with archeologists, almost none of them are aware of the historical artillery projectiles data given at the following three websites:
British Cannonball Sizes
Cannon bore, shot, and shell diameters for smoothbore guns
SolidShotEssentialsMod
That opinion is based on the fact that they contact me to get this kind of information.
Oh I just realized I forgot to mention a favorite... Spider shot... which was rare... was a bunch of chains linked in the center.
Now imagine that ripping across the deck. heh