Monday, March 20, 2017

Drum Selector

Telephones with drum selectors have a cylinder that is rotatable about a horizontal axis instead of a dial. The drum has the ten digits corresponding to ten indentations; The user puts a finger into a recess and thereby rotates the cylinder downwards until the stop is reached. After releasing, the cylinder ran back again.

Der Trommelwahlers were made by Siemens & Halske in Germany in the 1950s.

Via

No comments: