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ID number:  BIRRC-P0457
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Wolff, O.
Title / Object name:  Wheatstone Bridge
Object type:  Electrical instrument
Place made:  Berlin
Date made:  c. 1921
Materials:  Brass controls on bakelite panel on wooden case. Separate wooden lid
Measurements:  34 x 25.5 x 10 cm
BIRRC-P0457a.jpg

A Wheatstone bridge is a very common device for measuring electrical resistances. This is a high quality instrument for use as a standard at its time. The controls are all on a black bakelite panel on the top of a wooden box. The ratio arms of 1000, 100, 10, 1 are selected with plugs. The main arm has four rotary switches (with wiping contacts all exposed) giving resistances of 1 to 9999 ohms. The unknown X is mounted between two clamping screws. There are tapping keys with locking levers for the battery B and galvanometer G.

Inscriptions / Translations:  Otto Wolff, Berlin. 4170
Manganin. int. ohm richtig bei 20˚C

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