Siemens obach galvanometer, 1888.

 
Siemens obach galvanometer, 1888.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Description

Obach galvanometer made by Siemens Bros and Co.

Image Details

Image Ref.
 
10192965

© Science Museum / Science & Society Picture Library

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