When a vehicle passes over the switch, the two metal plates make contact closing the firing circuit.

The green light showed that the firing circuit was intact.

The charges from Krannon's gun, taken when he was killed, had been hooked together with a firing circuit.

A key that allows the captain to close one of four switches on the firing circuit.

Every rocket had to have its firing circuit inspected.

The firing circuit began to glow a dull red.

Two meters away, the firing circuit was growing hotter.

The weapon has numerous safety devices placed in the firing circuit.

Auto enables the off mount electrical firing circuit from the fire control system.

When the measured point in space was reached, the firing circuits were actuated.