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Scientific American, Vol. 60, No. 20 (1889) (1889)
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n with a small wire ; let it remain till perfectly dry. ber dried by steam pipes, or hot water or hot air heat- and allowed to cool before being opened. The rods or Avery thin hide, such as squirrel, cat, coon, is the ing apparatus, owing to fine iron dust being thrown plates arethen boiled fora… … ly, the wooden pieces are removed, and telephone. No. 18 copper wire for main line should be used. the carbon is left on the iron plate to © 1889 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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