The bomb probably was electrical and undoubtedly had been fused like the switchboard.
Jill remained where she was, leaning with one hand against the switchboard.
The switchboard instruments have already been described briefly.
He reached the switchboard and pulled one of the little levers.
There was a small thing which looked like the switchboard of a telegraph office.
He telephoned twice, vouchsafed the girl at the switchboard.
And even the telephone girl, smirking from her switchboard nearby.
Now the chandeliers in the ceiling had been lighted from the switchboard button.
Only an occasional buzz at the switchboard disturbed the silence of the place.
This is done by the large lever at the right of the switchboard.