Focimeter designed by Frank Herrmann in box

Focimeter designed by Frank Herrmann in box

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Focimeter designed by Frank Herrmann in box
Science Museum Group
© The Board of Trustees of the Science Museum

Focimeter designed by Frank Herrmann in box, ink markers not working

Details

Category:
Optics
Object Number:
1990-652
type:
focimeter
credit:
Bergman, A G