. The street railway review . us currents adopted by the General Electric Company is known as type M-D and has a spark gap of ^ in., which a 2,000 volt current will bridge. The gap is in a strong magnetic field so that the arc is at once blown out. To limit the current a low non-inductive resistance is placed in circuit. The Wirt alternating currentshort gap arresters, made bythis company, have been especi-ally designed to operate effec-tively with very small gapspaces. For 1,000 volt circuitsthere is a single ^j-in. sparkgap between two metal cylin-ders 2 in. in diameter and 2 One cy
. The street railway review . us currents adopted by the General Electric Company is known as type M-D and has a spark gap of ^ in., which a 2,000 volt current will bridge. The gap is in a strong magnetic field so that the arc is at once blown out. To limit the current a low non-inductive resistance is placed in circuit. The Wirt alternating currentshort gap arresters, made bythis company, have been especi-ally designed to operate effec-tively with very small gapspaces. For 1,000 volt circuitsthere is a single ^j-in. sparkgap between two metal cylin-ders 2 in. in diameter and 2 One cylinder is connect-ed to the overhead line and theother to the ground and a lownon-inductive graphite resist-ance placed in circuit. Thecombined action of the metalcylinders and non-inductive re-sistance prevents the heating ofthe cylinders when the lightn-ing discharge passes and theformation of gas which would enable the alternator to main-tain an arc. The arc itself is extinguished by the reversalof the alternating Ground FOR MAGNET-IC HI,0\V-OUT ARRKSTKR. For higher voltage the number of gaps is increased,exhaustive tests showing that for an i 1,000-volt, 5,000-h. there should be i^ gap spaces. The cuts show the connections for these two types. DAMAGE SUIT FOR FAILURE TO DELIVERCOPPER. In the supreme court of New York, a case was disposedof last week which has been in litigation some time ; the set-tlement being reached by a discontinuance of the suit ofthe Okonite Company against Holmes, Booth & Haydens. The complaint showed that in June 1895, Holmes, Booth& Haydens sold to the Okonite Company 300,000 lbs. cop-per at 12 v/ cents, and after delivering 50,509 lbs. stoppedfurther delivery. The Okonite Company then in September1895 purchased elsewhere the balance of the copper at 14cents, and sued Holmes, Booth & Haydens for the differ-ence, about $4,500. Holmes, Booth & Haydens denied thecontract. An order discontinuing the suit was entered inthe
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