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Holtzer-Cabbot Electric Co. Ayrton and Perry's Ammeter
Specifications
Holtzer-Cabbot Electric Co. Ayrton and Perry's Ammeter
Category
Science and Technology
Classification
CHENHALL - Tools & Equipment for Science & Technology - Electrical & Magnetic T&E - Electrical & Magnetic Measurement Devices - Instrument, Electrical - Ammeter
Keyword
Object Origin
Manufacturer:
Holtzer-Cabot Electric Company
Date Manufactured:
1880
Physical Characteristics
Object Description: Brass-colored metal meter with a curved top edge, flat bottom edge, four (4) metal knobs, and a horizontal metal cylinder. In the center of the object is a triangular clear glass window with a curved top edge. Behind the window is a white discolored meter with a scale of numbers ranging from 0 to 40. Black text is printed below the numbers. There is a single silver needle attached to the bottom of the meter. Above the window for the meter is a ho...
Marks: "Stop current before changing Commulalor / AYRTON & PERRY'S / Am-meter / C.W.HOLTZER / Maker"
Measurements: Object:
Height: 3.25 in, Width: 4.25 in, Depth: 5.5 in
Weight: 3.4 lbs
Credit
Gift of Shannon Physical Laboratory, Colby College, 30.263a
Display Status
On Exhibit
Holtzer-Cabbot Electric Co. Ayrton and Perry's Ammeter
About: Holtzer-Cabbot Electric Co. Ayrton and Perry's Ammeter
About: Holtzer-Cabbot Electric Co. Ayrton and Perry's Ammeter
First introduced for industrial use in 1879 by William Ayrton and John Perry of the Imperial College of Engineering in Tokyo, both of whom studied under British physicist Lord Kelvin, this 1880s ammeter was used to measure currents in electric lighting using electromagnetic induction. A magnetic field is induced by running a current through a metal wire, and an iron needle deflects to the right or left, reflecting the direction and strength of the current.
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