A cocking knob was pulled until cocked. This gun was cocked with external cocking levers on the side of the breech. During filming three guns were made, each with an enlarged loop on the cocking lever. The slide in a pistol performs similar actions as a cocking handle. The earliest use of a cocking/decocking lever is the Sauer 38H from 1938. The DEFA 553 is a gas-operated five-chamber revolver cannon using pyrotechnic cocking and electrical ignition. The trigger only became visible upon cocking the hammer. Pressing this while cocking the shutter prevents advancing the film. The trigger became visible only upon cocking the hammer. Earlier models had a separate mechanism for cocking the shutter. Cocking the hammer automatically advanced a disc into position. Despite the difficulties in cocking and firing the weapon, it did have several advantages. The cocking handle was pulled and released a second time. Another factor was that not all stoppages could be corrected by charging (cocking) the guns. Talmadge was motivated by his belief that Cocking favored racial integration.