Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 272
n instruments the form is altered, the fixedportions consisting of stout copper strips of no appreciable re-sistance (Fig. 155), the gaps in AE and EB being for the in-troduction of the unknown resistance, and a certain measuredresistance. The branches AF and BF are formed by a single Chap. IV.]… … Fig. 155. rod, whose upper surface is graduated carefully in millimetres,and read from both ends; so that the length of the two partsof the wire canl)e at once read off. This key is slid along thewire till the galvanometer remains at rest, whether the key isup or down, and in this position the…
Electricity
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