Electricity meter, c 1930.
UNITED KINGDOM - APRIL 13: A 'Type H' single phase service meter based on the electromagnetic induction principle. Inside this meter is a spinning plate moved by electromagnetic induction, which is geared to a series of dials that register the amount of electricity used, based on how much the plate rotates. It shows the amount of electricity used in kilowatt-hours (1000 watts of power for one hour of time). (Photo by SSPL/Getty Images)
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Getty ImagesElectricity meter, c 1930., News Photo
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來源: Science & Society Picture Library / Contributor
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