. Electric railway journal . and is therefore notsubject to the defacement of paper scales. The convenienceof manipulation is very striking, since it is only necessaryto rotate the index to balance. This feature adapts it foruse by those not skilled in the use of Wheatstone galvanometer in the ohmmeter is a sensitive DArson-val type as used in the portable testing sets of the manu-facturers. A NEW TROLLEY EAR The General Electric Company has recently placed on themarket a new mechanical clamping ear, known as formM. It is made of forgings and punchings of steel, thuseliminating ent
. Electric railway journal . and is therefore notsubject to the defacement of paper scales. The convenienceof manipulation is very striking, since it is only necessaryto rotate the index to balance. This feature adapts it foruse by those not skilled in the use of Wheatstone galvanometer in the ohmmeter is a sensitive DArson-val type as used in the portable testing sets of the manu-facturers. A NEW TROLLEY EAR The General Electric Company has recently placed on themarket a new mechanical clamping ear, known as formM. It is made of forgings and punchings of steel, thuseliminating entirely such imperfections and variations asare common to iron castings. This feature also permitsthe use of small light sections of great mechanical strengthand results in an ear which gives a maximum clearancefrom passing trolley wheels and a minimum height fromthe center of the wire to the top of the clamping jaws are duplicate drop forgings so that each lipshould fit into the recesses of the trolley wire with abso-. New Trolley Ear lute accuracy. The jaws are hinged by a steel pin locatedclose to the wire and are of a length sufficient to utilizethe maximum clamping effect produced by the clampingnut. The machine steel stud jacket engages shoulders onthe clamps and fits into the hexagonal interior of theclamping nut. Thus by rotating the nut the stud jacketis drawn on to the suspension stud while the nut exertsan outward pressure on the upper outer edge of the jaws,which, by reason of the hinge, press against the trolleywire. The punched washer is formed around the top of thejaws to prevent its turning while the clamping nut is be-ing tightened. It is also provided with two small lugswhich may be bent up against the side of the clampingnut, effectually preventing any possibility of the ear be-coming loosened in service. The new ear is made up to take round, grooved andfigure 8 wire, and is furnished with either japanned orstandard sherardized finish. The form M ear, w
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
