. Electrical world. made from punch-ings, combining strength, lightness and smoothly finished surfacesat a cost which enables the makers to adopt popular prices. Thereare no springs to get out of order, the only thing of this kind being February 20, 1904. ELECTRICAL WORLD and ENGINEER. 373 the flat strip which carries the carbon arcing tip and which alsoserves to throw back the movable arm when the breaker is screws are locked and the adjustments are few and permanent. The movable contact is a laminated brush made from leaf copperand protected by a copper shunt, and so arranged that
. Electrical world. made from punch-ings, combining strength, lightness and smoothly finished surfacesat a cost which enables the makers to adopt popular prices. Thereare no springs to get out of order, the only thing of this kind being February 20, 1904. ELECTRICAL WORLD and ENGINEER. 373 the flat strip which carries the carbon arcing tip and which alsoserves to throw back the movable arm when the breaker is screws are locked and the adjustments are few and permanent. The movable contact is a laminated brush made from leaf copperand protected by a copper shunt, and so arranged that when the Motors for a Silk Factory. Every manufacturer of textiles knows the importance of con-stant speed in weaving. By this is not meant the slight variationm speed which takes place gradually from hour to hour and whichis frequently found in the best steel plants, but the sudden variationbetween one pick and another caused by lost motion in some partof the power transmission. It may be slippage of belt, or back. Figs, i, 2 and 3.—Carbon-break Circuit-breaker. breaker is opened the current is shunted to the carbons above. Thearc occurs when the final break is made on the carbons, the con-struction of the contacts aiding the natural tendency of the arc torise and preventing it from being communicated to the other liveparts. Flexible braided leads carry the current from the movablecontact brush to the terminal, thus reducing the number of movablecurrent-carrying contacts to a minimum. The temperature rise ofthe contacts is, in consequence, never over 20° C. with a normalcurrent. The breaking mechanism is simple. The current passes througha coil through which is thrust one pole of a laminated iron horseshoeelectromagnet. The armature is attached to the other pole of themagnet, and is so placed that a current sufficiently strong will draw-up the free end of the armature, a movable counterpoise servingto vary the amount of current required. When the armature isdrawn up contac
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
