[Trade Journal]
Publication: The Telegrapher
New York, NY, United States
vol. 8, no. 42, p. 330, col. 3
Comparative Test of Insulators.
WE have received the following statement of the results of a galvanometrical test of insulators made at Altoona, Pa., in rain, on the 10th of May, by Mr. William McCormick, of the telegraph department of the Pennsylvania R. R. The deflections were taken on a Siemens universal galvanometer with 100 cells Callaud.
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