Siemens galvanometer, c 1890.
4 0 c m
 
36cm
actual image size: 28cm x 32cm

Siemens galvanometer, c 1890.

© Science Museum / Science & Society Picture Library

Description

This device was used to locate electrcity leaks, bad contacts and faults in telegraph wires. Galvanometers would compare the current in two similar wires, and then make a diagnosis.
 

Image Ref.

10212063
 

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