. Electrical world. g kineto-scopes are displayed. Some of the small motors and generators of the Roth Bros. & Co.,Chicago, are adapted to special lines of work. One dynamotor ofthe transformer type is used by telephone exchanges for ringing bells claimed for this controller are as follows: It absolutely limits themaximum current which may flow to the motor, thus protecting themotor, gearing and machinery from the effects of abnormal torque;the protection of the motor and machinery does not depend uponthe judgment of the operator; the controller protects the motorperfectly in case the voltage
. Electrical world. g kineto-scopes are displayed. Some of the small motors and generators of the Roth Bros. & Co.,Chicago, are adapted to special lines of work. One dynamotor ofthe transformer type is used by telephone exchanges for ringing bells claimed for this controller are as follows: It absolutely limits themaximum current which may flow to the motor, thus protecting themotor, gearing and machinery from the effects of abnormal torque;the protection of the motor and machinery does not depend uponthe judgment of the operator; the controller protects the motorperfectly in case the voltage of circuit fails. Even if the controllerbe left in the full on position, when the circuit is re-established,the controller will automatically start the motor with the normalamount of current; the operating controller is small and compact,easy of operation and protected from arcing. A three-ton lifting magnet attached to a hoist is shown lifting steelplates and billets. Magnetic friction brakes and a cushion type. fiu. J.—kOIH BROS. EXHIBIT. with attachments for the howler, busy back, automatic ringingand pulsating current for party lines. Electric grinding andpolishing lathes, forge blowers, motor-generator charging sets, mo-tors for 1/16 hp to IS hp form interesting features of the motor-generator set will furnish light and power for the exhibit. The Electric Controller & Supply Company is exhibiting in SectionS an entirely new system of control where the service requires fre-quent reversals of the driving motor under load. This control hasbeen applied chiefly to the table motors in steel mills where a stopfrom full speed and acceleration to full speed in the reverse directionof a so-hp motor under load is required in less than 30 adaptation of this system to the operation of planers is shown FIG. 5.—BOOTH OF AUTOMATIC ELECTRIC COMPANY. solenoid are exhibited and in operation. The remainder of the spaceis filled with a line of controllers for all purp
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
