. The Street railway journal . transformers, isolating under-ground or overhead feeders and mains from main systems andoperating inductive leads of all kinds, led the WestinghouseElectric & Manufacturing Company to design and place uponthe market a switch that meets all these requirements. It is adouble-pole, single-throw switch, mounted in a weatherproofcase, which may be easily attached to poles or cross-arms in thecase of overhead systems, or may be hung in manholes whereimderground systems are used. May 6, 1905.] STREET RAILWAY JOURNAL. 839 The essential features consist of knife-blade con
. The Street railway journal . transformers, isolating under-ground or overhead feeders and mains from main systems andoperating inductive leads of all kinds, led the WestinghouseElectric & Manufacturing Company to design and place uponthe market a switch that meets all these requirements. It is adouble-pole, single-throw switch, mounted in a weatherproofcase, which may be easily attached to poles or cross-arms in thecase of overhead systems, or may be hung in manholes whereimderground systems are used. May 6, 1905.] STREET RAILWAY JOURNAL. 839 The essential features consist of knife-blade contacts sub-merged in oil and high insulation between poles and betweenframe and live parts. Knife-blade contacts are used, as theyinsure the best contact for low temperature rise. Each jawhas a detachable arcing piece which takes the final break, thuspreventing any possibility of arcing between the jaws andblades. These arcing pieces may be removed very easily whenworn out or burnt away. Suitable barriers are placed between. To produce such a bar in hard-drawn copper either the headmust be riveted to each segment, with the always present pos-sibility of an imperfect electrical connection, or, to be equiva-lent in effectiveness to a drop-forged bar, a segment must bedrawn, often nearly twice the width of the segment time and labor must be expended to cut these bars toshape, resulting in a loss of material also, which makes thisprocess prohibitive, since, being no better, if as good as thedrop-forged commutator, it must compete in price. In contradistinction, the majority of the motors turned outby the General Electric Company have conmiutators of theheadless type. In these comnuitators, if there is any virtue in
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
