Sangamo Electric Company D-5 Wattmeter, circa 1914
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Artifact Overview
In the late 1800s, companies that supplied electricity to consumers needed a way to measure how much customers used--and then charge them accordingly. Induction-type wattmeters proved reliable and would become the industry standard, but until 1910 Westinghouse held the patents. Sangamo Electric Company, which had not been granted a patent license, produced a mercury-motor alternative. This version was made well in the 20th century.
Artifact Details
Artifact
Wattmeter
Date Made
circa 1914
Creators
Place of Creation
Location
Not on exhibit to the public.
Object ID
29.1980.1407
Credit
From the Collections of The Henry Ford. Gift of the Edison Pioneers.
Material
Metal
Glass (Material)
Color
Black (Color)
Dimensions
Height: 11.75 in
Width: 6.75 in
Length: 5.5 in
Inscriptions
on plate:
TYPE D-5 THREE WIRE/ 110/220 VOLTS 25 AMPERES/ NO. 343260/ 1 REV. OF DISK = 3 1/3 WATT HOURS
in raised letters on front:
SANGAMO ELECTRIC/ COMPANY/ SPRINGFIELD ILLINOIS
on readout:
KILOWATT HOURS
on box at bottom:
LINE LOAD
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