. The Street railway journal . FIG. 3.—STUTTGART MOTOR CAR AND TRAILER EQUIPPEDWITH HYDRO-ELECTRIC BRAKE main piston to gradually return to its original position, thusreleasing the brake gradually. As soon as the current is cut offfrom the coil (7), the small valve (8) is closed by the spring(9) and the brake piston ceases to move. In this*manner anybrake pressure desired from that at which the brake wasoriginally set to zero may be obtained. This feature is mostvaluable in making proper stops, due to the fact that the co-efficient of friction increases as the speed decreases, thus neces-sitat
. The Street railway journal . FIG. 3.—STUTTGART MOTOR CAR AND TRAILER EQUIPPEDWITH HYDRO-ELECTRIC BRAKE main piston to gradually return to its original position, thusreleasing the brake gradually. As soon as the current is cut offfrom the coil (7), the small valve (8) is closed by the spring(9) and the brake piston ceases to move. In this*manner anybrake pressure desired from that at which the brake wasoriginally set to zero may be obtained. This feature is mostvaluable in making proper stops, due to the fact that the co-efficient of friction increases as the speed decreases, thus neces-sitating a decrease of the brake pressure in proportion to the. FIG. 4.—ANOTHER VIEW OF THE STUTTGART EQUIPMENT speed, so that no uncomfortable shock will be felt as the trainis brought to a stop. It is valuable also for use on cars whencoasting down long hills with varying grades. To release the brake instantaneously, the controller handleis turned in the opposite direction to that used in applying thebrakes. This admits a greater amount of current to the valvecoil (7) than that used for the gradual release, which opens the large valve (6), allowing the liquid to escape rapidly fromthe rear of the piston, which is immediately returned to theposition shown by the spring 10. An emergency stop ismade by turning the controller handle through 80 degs. to thelast braking position which allows the maximum current toflow, giving a total pressure on the brake-shoes nearly equalto that of the weight of the car. Any number of these brakes may be connected together on atrain so that all can be operated through a single controllerlocated any place on the tr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
