Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 255
int where contact is thus made shouldbe exactly opposite to the point on the scale at which the littleindex carried by the key is then pointing. The bridge BOBconnects the piece B and the key B; the battery terminals areconnected with A and C. Referring to fig. i. of § 4, we see that we have… … CH. XIV, MEASUREMENT OF RESISTANCES 229 the point B is moveable, so that we can make the ratio s : sanything that we please. In using the instrument we insert our unknown resistance atr, and a resistance box at r. We then adjust the position of thekey B until the making of contact with the wire at…
Electricity
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