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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

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...

Materials:

metal

glass

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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