Bishop Harman - Bishop 14Harman - Aperture test (1) - Metal

Description
Bishop Harman - Bishop 14Harman - Aperture test (1) - Metal
England - First half 20th century

Instrument invented by Dr Bishop Harman in the early 20th century. Limited use especially in England. See google: Bishop Harman diaphragma test

Lot details
No. of items
1
Object
Aperture test
Material
Metal
Designer/ Artist
Bishop Harman
Manufacturer/ Brand
Bishop 14Harman
Model/ Name
Diaphhragma test Binoculair Zien
Estimated Period
First half 20th century
Country of Origin
England
Condition
Fair condition - heavily used & with possibly minor parts missing
Dimensions
42×10×12 cm
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