Vintage projection display teardown

I think I bought these from a shop called RME in Glasgow many decades ago. They're "IN-LINE" projection displays manufactured by Counting Instruments Ltd in the UK.

Displays like this would have been used in electromechanical factory machines and counting and weighing applications. Because so little of the light from the tungsten lamps is used, the displays are very dim, so they need a light shield if they are in a brightly lit area.

Control is by switching AC or DC to the appropriate digit's tungsten lamp.

I worked on old equipment like this in the past and it was notable for the huge wiring looms. Quite intimidating to work on initially until you get familiar with the circuitry.


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