Siemens & Halske electrical bridge

Siemens & Halske electrical bridge

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Description (Brief)
This alternating current bridge consists of a circular base, on the outer circumference of which is a slide wire. A contact on a radius arm makes contact with the slide wire to form two arms of a Wheatstone bridge. Graduated disc with movable black handled pointer. Plug in resistors are arranged on the base as the other arms of the bridge. Wooden phones with leather handles are used as detectors, manufactured by Siemens and Halske, Berlin, Germany. Marked with S&H logo. The bridge is used to measure the inductances and effective resistances of circuits, such as coils, etc. The source of the testing current was an alternating current generator made by the same firm. It consisted of a toothed wheel revolving past a magnetic circuit including a coil in which alternating current was generated at frequencies up to 2,000 cycles per second.
Location
Currently not on view
Object Name
Bridge
resistance bridge
bridge resistance
Other Terms
Bridge; Measuring Devices
date made
ca 1906
maker
Siemens & Halske
Measurements
overall: 10 in; x 25.4 cm
ID Number
EM.313272.01
catalog number
313272.01
accession number
181342
Credit Line
from Weston Electrical Instrument Corp., thru John H. Miller
See more items in
Work and Industry: Electricity
Data Source
National Museum of American History
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