tool
Bell drill
This is a gimlet with approx. 40 cm long bit to drill through door frames
when an electrical wire has to be inserted. It is useful in relatively
light materials such as plaster and wood for door frames, ceilings, walls
and floors. Especially in the period of electrification, this drill was
widely distributed, for the installation in existing buildings of a
telephone, a doorbell or for internal calls for staff or visitors. [MOT]