PREDETERMINED AUTO DIALLER, 1930's

Telephone early automatic dialler, on the drum are a selection of names when the drum is moved such that the name required is in the window on the front, the lever handle is turned, this resets all the pins inside accept those for the name chosen, also at the back of the pins is a dial mechanism that is set to the movement scanning all the pins, as it passes over the protruding pins set earlier by the drum, the contact on the dial pulses out the correct number across the telephone line.

A0757