By striking semantra (rectangular metal bars roughly the diameter of a pencil, but of varying lengths) with an electric solenoid.

It was characterized by the use of an electric solenoid to operate the trigger and a hydraulic system to charge the weapon.

The shutter-tripping device to set off the cameras simultaneously was made from tiny electric solenoids found in a discount goods catalogue.

Most of the traps and other percussions were powered directly by electric solenoids and not pneumatics as with most other contemporary pit organs and photoplayers.

A hydraulic gear change arrangement of oil operated clutches could be engaged by an electric solenoid to increase this ratio to 8.095:1 in high speed blower position.

This much larger gun is cycled by an electric solenoid and powered by compressed air.

Door handles are also "shaved" as well, electric solenoids or cables are installed.

The device is an electric solenoid that controls a valve which is placed on the front brake line, and is controlled by a switch.

In this panel, electric solenoids were used to shift hydraulic valves.

Below the paper path were a set of 120 or 132 "hammers" that were triggered by electric solenoids.