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1938 - Peterman automatic machine forms and cuts to length, with a tolerance of one-thousandth of an inch

INVISIBLE WIRE

CD 1966046 E&MP30.002

Electric Meters

May 18, 1938

The smallest meters use wire that is almost invisible -- .0008 of an inch in diameter, about one-fourth the thickness of a human hair -- and the tiny watch-wheel shafts must be almost as fine.

Above, a Peterman automatic machine forms and cuts to length, with a tolerance of one-thousandth of an inch. 


Original Caption by Science Service
Westinghouse



National Museum of American History

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