he train is very quickly | middle of the track, so as to remove the earth from the | result is liable to. be inaccurate. leveled, saving a great deal of manual labor. and doing the | vicinity of the track and from the ends of the ties. The extreme delicacy of the action of the galvanometer work… … ion common to both. All of : sition when no current passes the pinion shafts are squared ; RECORDING GALVANOMETER. through the helixes, and the to receive a socket wrench needle is unaffected by terres- provided’ with a wheel by trial magnetism. which the shaft may be turned so as'to spread the…
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