Johnson Enlarging Timer
Circa 1954

Johnson of Hendon Ltd London England

Smiths Industries

2 ¼” face. Seconds and minutes hands. The time, up to 6 minutes, is set on the clock’s face, which then runs down when the clock is started. A push-button starts the timer, and a sliding switch controls the enlarger lamp for focusing, etc.

Construction: Black plastic body.

This is placed in the electric circuit of the enlarger and switches the enlarger on for the pre-set time.

Source: http://www.earlyphotography.co.uk