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Scientific American, Vol. 42, No. 15 (1880) (1880)
leaf 7
. Sawyer says that one of these = pencils, used for five hours a day, will last at a minimum | WA lig L < SS . SS calculation from his experiments, not less than ninety days, (any |} and, at a maximum, fortwo years. The cost of the pencil SIA, =e | is a trifle less than two certs, and the cost of… … © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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