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Scientific American, Vol. 89, No. 7 (August 1903) (1903)

leaf 3

An illustration from Scientific American, Vol. 89, No. 7 (August 1903), 1903, leaf 3
GEOMETRIC FIGURES AUTOMATICALLY DESCRIBED BY THE CAMPYLOGRAPH. © 1903 SCIENTIFIC AMERICAN, INC August 15, 1903. Scientific American. 117 AN AUDIBLE AND VISIBLE RAILWAY SIGNAL FOEGRADE CROSSINGS, OPERATED BY A HIGH TENSION CURRENT. BY EMILE GUARINI. Among the novelties recently introduced by…

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