Running -[ HMM ]-

Graflex 800/900 series 16mm projector control button. Pressing this button starts the projection lamp cooling fan and, only if the function lever is in the Forward or Reverse/Rewind position, the projector motor. The projection lamp is controlled by a separate set of Off/Lo/Hi Lamp buttons interlocked with the Run button and the function lever.. Pressing the Stop button releases both Run and Lamp buttons.

 

With the function lever on Forward and a Lamp button pressed (turning the fan on, but not the lamp), a show can be started with a single press of the Run button turning on both the motor and the lamp.

 

Yes, that's over fifty years of patina and crud on the switch bezel. The projector I linked to has long been scrapped; this switch is on an older model 815 (with a vacuum-tube amplifier!) that needs cleaning up.

 

Done