Very rare  deflection meter galvanometer

Very rare deflection meter galvanometer

€ 195

Very rare deflection meter galvanometer

Dimensions

11,5 X 9,5 X 15 cm

Circa

1900

Country of manufacture

UK and Ireland

Categories: Scientific, Technology, Office Antiques, Other Technology Antiques

Description

 This instrument is a galvanometer, a meter used for balancing or testing an external electrical circuit. In the days before absolute measurements were reliable the method used was to connect a known fixed resistance, a battery, and a variable resistance across the circuit to be measured, in what was known as a “bridge” configuration. By altering the value of the variable resistance the resistance of the external circuit could be calculated. A galvanometer, which is a centre-zero meter, often a moving coil type, was connected so that positive and negative current could be balanced out. At the point where the meter read zero the variable resistance setting was read. Often this resistance was in the form of a box carrying plug-in shorting elements such that a very accurate value could be read by adding up the resistors not being shorted out.

 

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NL Early Science

Early Science antiques was founded in 1978 by Fred de Vree based in the Netherlands where I can also be visited by appointment. I have been active for 4 decades as an antiqair and auctioneer, the last 20 years of which are specialized in scientific antiques. I visit collectors and fairs in many European countries. looking for special items please feel free to contact me by Phone or email ,if you need any information on my listed items or something you are looking for 0031653132842 freddevree@kpnplanet.nl

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