Ammunition Reserve Counter, B-36 Peacemaker P-3 Orion The complete assembly is suspended

The complete assembly is suspended in gimbals

M6 periscopes in each late model Sherman

The detonator spring does trigger the switch mechanically

According to its spec sheet from the Army/Navy Index of Aeronautical Equipment

and the Degrees Steering indicates the direction toward the target from the current course of the aircraft

Ammunition Reserve Counter, B-36 Peacemaker P-3 Orion The complete assembly is suspendedThis is a US Air Force, Cold War era electromechanical Ammunition Reserve Counter, used to display the rounds of ammunition remaining in reserve, up to 999 rounds, as the aircraft's guns have been fired. The wheel at the left of the digit display counter is used to set the total rounds loaded into the aircraft. The small protrusion right of the digit display counter was used to reset the counter to zero once pressed, but it is either non functional or