. Journal of electricity. the stop button and both overload relay trip con-tacts. The closing of the main contactor connects the con-trol circuit to the line at H and this holds in the main con-tactor independent of the start button. The reader will note,therefore, that the control circuit will be broken and thecontactor opened if either of the overload relays operate, thestop push button is depressed, or the main contactor opensdue to low voltage or other cause. Except on some of the smaller sizes both poles of themain contactor are equipped with powerful magnetic blow-outs. The clapper switc
. Journal of electricity. the stop button and both overload relay trip con-tacts. The closing of the main contactor connects the con-trol circuit to the line at H and this holds in the main con-tactor independent of the start button. The reader will note,therefore, that the control circuit will be broken and thecontactor opened if either of the overload relays operate, thestop push button is depressed, or the main contactor opensdue to low voltage or other cause. Except on some of the smaller sizes both poles of themain contactor are equipped with powerful magnetic blow-outs. The clapper switch fingers are standard CH butt con-tact construction with hard drawn copper tips. By the use of shading coils these contactors possess great holding power,and a total absence of magnetic hum. The relays used on these panels are of that type inwhich the length of time between the instant the overloadcondition arises and the instant of opening the control circuitis inversely proportional to the amount of the overload. They. Diagram of connections give adequate protection to polyphase induction motorsagainst excessive continued overloads and yet permit a largeinitial inrush of current for starting. The complete panel is known as the Across-the-Line TypeSelf Starter and is manufactured by the Cutler-HammerMfg. Co. at their works in Milwaukee, Wis. The Attractograph A new type of moving picture machine for office, con-vention and show window has been brought out by the At-tractograph Company, 220 West Forty-second street, NewYork City. This machine displays pictures which can bereadily seen in broad daylight as well as by night. Its opera-tion is entirely automatic in all its functions. After the reelis projected it is automatically rewound and then displayedagain, so that after the machine is arranged and started itwill continuously operate for an indefinite period, without anyfurther attention. The outfit consists of two separate parts, the movingpicture machine and miniature thea
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
