. Electrical world. stance brushesbeing now at the top of their travel. The regulator is retarded in itsdescent, so that the resistance in circuit is gradually reduced untilthe circuits are as shown in the diagram. This action affords agradual dynamic brake. It is seen that the reversing switches cannot be operated unlessthe resistance brushes are at the lowest position where all the start-ing resistance is in circuit, as soon as one of the reversing switchesfs energized. Resistance tubes of suitable capacity are inserted in the operatingcoils after action, so that the temperature rise is hard
. Electrical world. stance brushesbeing now at the top of their travel. The regulator is retarded in itsdescent, so that the resistance in circuit is gradually reduced untilthe circuits are as shown in the diagram. This action affords agradual dynamic brake. It is seen that the reversing switches cannot be operated unlessthe resistance brushes are at the lowest position where all the start-ing resistance is in circuit, as soon as one of the reversing switchesfs energized. Resistance tubes of suitable capacity are inserted in the operatingcoils after action, so that the temperature rise is hardly and the mode of winding of coils insures absolute indestructi-bility. The contacts are of ample capacity, readily renewable as willbe seen by a glance at the engraving of the controller. Indeed,some of the elevators have been in operation for a year, and expe-rience so far indicates that the cost of maintenance will be almostnothing. Reference has also been made to the two form lifts of the push-. FIC. 24.—VIEWS OF ELEVATOR CONTROLLER. button type, operating between the composing room and the press-room floors. These were also supplied by the Otis Company. Onthe form lifts exact stops are made from a speed of 300 ft. per min-ute by the automatic slowing device, which operates only at thelanding for which the car is destined. At the same floor a signallamp remains lighted and the car is held until the load is removedor put on and the door closed, when the car may be directed to anyother floor. The total lift is 100 ft. The hoists are provided inpermanent elevator shafts, housed in well above the floor, and areeach equipped with a lo-hp motor, no volts, direct current. Thecars are 4 ft. by 6 ft. 6 in., so that a large chase can behandled quickly; and it will have been understood from previouspassages in this article that the hoists are a material factor in secur-ing the great dispatch with which much of the work is executed. ELECTRIC HEATING APPUCATIONS. Per
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
