American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 155
t in measurements of E. M. f. and current strength the results are givenupon a scale without further calculation. The instruments are also dead beat/and the portable kind require no leveling and are not materially, if at all, affectedby external magnetism. In Fig. loi^ an ammeter is illustrated as…
Telegraph
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