American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 179
nknown resi stance in circuit. For example, if an unknown resistance be substi-tuted for E, Fig. 123, and a deflection of 50 divisions be obtained, without the shunt,the resistance woul be ^^Vo^ °° — 500,000,000 ohms. Or, this conclusion may bereached in another way. For example, assuming, as… … INSULATION RESISTANCE, ETC. 145 unknown resistance is 5,000 times greater than 100,000 ohms, since it must have re-duced the current 5,000 times, (as evidenced by the diminished deflection). Hence theknown resistance, 100,000 X 5,000 = 500,000,000 obms, as before. The usual connections for this…
Telegraph
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