Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 254
as in Fig. 147 a circuit consistingof a battery (A), a galvanometer (ff), a box of resistance coils(E), and the unknown resistance (X), whose terminals areconnected with the mercury cups (B, G). When the batterywire (P) dips into B, and the coil (X) is included, read thegalvanometer. Next lift the… … Fig. 147. (2) By calculation.—Let E be the E.M.F., and r the internalresistance of the battery, g the galvanometer resistance, andx the unknown resistance. 2 $6 Electricity. [Book in. Take out all resistance except that of the battery andgalvanometer (when the battery is said to be…
Electricity
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