Inspection lamp with circular fluorescent tube and magnifyer, 1967.
4 0 c m
 
37cm
actual image size: 29cm x 32cm

Inspection lamp with circular fluorescent tube and magnifyer, 1967.

© Science Museum / Science & Society Picture Library

Description

Lamp shown in use. An electrical discharge in mercury vapour and argon (or other rarified gas) produces the ultra violet light. Fluorescent materials on the inner wall of the glas tube convert the ultra violet into visible light.
 

Image Ref.

10276205
 

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