. Electrical world. eedgovernor at the top of the hoistway, and may be thrown on by theoperator in the car. This action controls the switches which imme-diately stop the machine. The guide rails for the car are cold-rolledsteel, and are supported every four feet by reamed bolts. The over-head construction work has no holes in the flanges of beams. The passenger cars have bronze cages and other parts are made tocorrespond in finish. Throughout the work is of the highest grade,and the operation of the cars is prompt and at the same time ex-ceedingly smooth. The scheme of motor connections herewi
. Electrical world. eedgovernor at the top of the hoistway, and may be thrown on by theoperator in the car. This action controls the switches which imme-diately stop the machine. The guide rails for the car are cold-rolledsteel, and are supported every four feet by reamed bolts. The over-head construction work has no holes in the flanges of beams. The passenger cars have bronze cages and other parts are made tocorrespond in finish. Throughout the work is of the highest grade,and the operation of the cars is prompt and at the same time ex-ceedingly smooth. The scheme of motor connections herewith (Fig. 25) shows thatone resistance is used for starting and stopping the motor. It willbe interesting to refer to this diagram in detail. When all theswitches are down the armature is seen to be on closed circuit oflow resistance. It will also be noted that a small quantity of cur-rent is allowed to pass through the shunt field by the resistance F current is less than two amperes on no-volt circuit, but is. FIG. 22.—VIEW OF SINGLE ELEVATOR. sufficient in connection with the resistance S to provide a dynamicbrake for stopping. Beginning with the switches in this position, the operation may bedescribed as follows: Let the car switch be moved toward up. Thefirst movement sends current from the plus line through the wire - cto the car switch, and thence through the contact U and the U limitto the up magnet, thence through the wire U, and bridges 6 and 7and wire -c to - line. The up magnet is now lifted, bridge No. 1making the circuit from - line to /, and bridge No. 2 making the cir-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
