The pressing of this ball actuates a detonator inside the flask I carry in my pocket.
But this is only a single barrel, and an old-fashioned sort of detonator.
It was to destroy itself; the Solarite would merely be the detonator to set it off!
The instant he brought the wires in contact, the detonator went off.
This ignition fired a detonator, which in turn fired the dynamite.