Posted by Steven Allen on January 26, 2023 at 05:09:06 from (67.6.89.10):
In Reply to: Cannons for Cannons posted by big tee on January 25, 2023 at 16:36:47:
For what it's worth, ACW-era field artillery pieces were not measured in calibres.
As a rule, smoothbore guns and howitzers were categorized by the weight of a round shot that fit the bore. For example, the popular 12 lb gun, Model 1841; the 12 lb gun-howitzer (Napoleon), Model 1857; and the 12 lb Field/Pack Howitzer, Model 1841, were all 4.62" bore pieces as that size allowed a 12 lb shot/shell in the tube (with a fraction, about 1/10", for windage). Some obscure guns did not use round iron shot but rather lead projectiles that were shaped like huge Minie' bullets. Even so, the guns were designated by what round shot they would use rather than by the weight (or size) of the conical projectiles.
Rifled guns were coming to vogue at the time, and, since they used elongated bolts, not round shot, this method of categorization was not adequate although it was used alongside the new method for some time. The new method did employ bore diameter, such as the 3" Ordinance Rifle and the 2.9" and 3" Parrot rifles. The Parrots were also known as 10 lb rifles because the common solid bolts used (there were a large variety) averaged about 10 lbs.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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