o instruments that I had con- surrounded by the two bobbins, B B, in such a way that the don, which is on the elevated railroads and taken down at structed some time ago. The first of these (Fig. 1) consists distance between the pole of each arm and the lower arma- of a soft iron needle mounted on… … is necessary to remark that the weight of the entire movable one wire only would be almost as great as for many of them. about two knife edges, and inclosed within a galvanometric portions of the balance is greater than that of the movable Then again there must be places near together on the lines…
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