PURPOSE: To improve the inspection ability of an electric circuit and the characteristic of the revolution of a body of revolution, in a device of the body of revolution such as an instantaneous drive gyro-device.

CONSTITUTION: When using, electric signals generated from a trigger signal generator 2 are transmitted to an electric blasting cap 5 through connecting wires 10 and lead wires 11 for disconnection, thus activating the electric blasting cap 5, then instantaneously burning an ambient propellant 6. Generated high pressure combustion gas is jetted from a nozzle 7 mounted in the outer circumferential, tangential direction of a rotor 1, the rotor 1 is turned as the reaction and the lead wires 11 for disconnectin are twisted off. Consequently, this device of a body of revolution can shape a stable electric blasting cap circuit before applying a trigger signal, and the lead wires are cut after applying the trigger signal, thus resulting in a condition with no friction torque, then improving the inspecton ability of an electric circuit and the characteristic of the revolution of the body of revolution.