A critical part is missing though: the detonator or electronic trigger device.

The trigger device looks like the eraser on the pencil.

Then there is a trigger device that starts the timer.

The actual prop was piston-driven and had a trigger device inside.

I provided the engineering and made the scale model for the trigger device, but others worked on the actual construction.

Merriweather had moved to a corner of the room, where there was a double trigger device.

He remembered another trigger device in the outer room that contained the white mice.

In 1955, a lateral transfer and trigger device (slip) was installed.

Immediately behind Jarvis was a man carrying one of the trigger devices.

Her eyes dropped to the trigger device in his right hand.