Gene,
I followed a link from a post on this board to another board. I poked around and found a link there to the Beeman site. Even though I have used the library here, I totally missed the Lewis article on the Beeman website. BTW: The library here is very good. Thank you for taking the time to make it available to us!
I was amazed at the power of that air rifle. The one they test fired was a replica that was meticulously made from the original design. It's .464 cal @ 154gr, and flattens out the lead balls it shoots upon impact. Just incredible when you get into the depths of the research. For an airgun design from 1780 (or there abouts), it just amazes me. Rifled barrel and all. Just the considerations that went into the construction of the air pump for military use are impressive. The designer/builder was truely a master of his trade. Just think that 1500 were manufactured, with support tools and extra air cannisters, all before the aid of modern design and construction techniques... Just amazing.
Mark