Merwin & Bray .42 Caliber Cupfire Revolver

One of the many revolver systems designed to work around the Rollin White patent was the Pant’s Patent cupfire revolver, made by Merwin & Bray in several calibers (.28, .30, and .42). This particular example is a nice on in .42 (which is the diameter of the cartridge case; the projectile is actually .39 caliber). The cupfire system was similar technically to rimfire, but with the priming compound in the base of the hollow cup at the end of the cartri