![](http://www.alamy.com/thumbs/6/15B97D56-B5DD-41B8-8526-CC07B50DA487/2XG6E78.jpg)
A 19th century engraving showing a Sine Galvanometer
Size: 4677px × 5906px
Photo credit: © Colin Waters / Alamy / Afripics
License: Licensed
Model Released: No
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