Absolute Electrometer, Braun’s

The needle, which is made of aluminium, moves about a horizontal axis of hard steel, and is repelled from the vertical brass piece connected with the knob above.
The glass at both sides allow the projection of the position of the needle to a screen with a lantern, something useful in lectures.

(http://www.nature.com/nature/journal/v46/n1181/abs/046150b0.html)

Data
Inventory Number: 
ELE124
Date: 
1900-1910
Maker: 
Instrument Categories: 
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