"Ward, all of the.earth discharged.by the train is very quickly I middle of the track, so as to remove the earth from the leveled, saving a great deal of manual labor, and doing the j 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 through the helixes, and the EECORDING GALVANOMETER. 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 wings as…
