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Scientific American, Vol. 88, No. 1 (1903) (1903)
leaf 4
enna and two one-thousandths of an the earth, and to which are due false signals, especial- inch in diameter and the ly in this type of appar- platinum wire is about atus, the system of circuits six onehundredt hou- sandths of an inch in dia- shown in Fig. 3 is used. It consists of two circuits,… … a silver shell, and this © 1903 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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