Martin Primer from A Cartridge Collector's Glossary

[Ar180shooter]

I found this fantastic glossary when I was searching for how Martin primers work. It's a great little illustrated glossary that would serve as a great reference for anyone looking to get in to cartridge collecting.

MARTIN PRIMER - A patented U.S. inside-primed cartridge (patents #88,191, 3-23-1869; #111,856,2-14-1871) with a relatively complex folded case design. Its principal identifying feature is a large, circular primer-like disc in its head. Mostly found in copper-cased.50-70 cartridges, .44,.45 and .50 caliber pistol cartridges. Rarely found in brass, or other calibers.

http://cartridgecollectors.org/glossary.htm