. Electric railway journal . age changer will keep one collector up whenever the other is down. Thevoltage changer is connected to the low-tension trolley andthe low-tension coil of the main transformer. The lattercoil is connected to the contactor circuit only when cur-rent is being collected at the higher potential. When themotors are on the low-voltage trolley the contactors are inthat circuit. Hamburg-Blankenese-Ohlsdorf Railway Improvements—High-Tension and Low-Tension Collector control circuits, through the compressor fuse and com-pressor contactor to the motor, from which it is led togr
. Electric railway journal . age changer will keep one collector up whenever the other is down. Thevoltage changer is connected to the low-tension trolley andthe low-tension coil of the main transformer. The lattercoil is connected to the contactor circuit only when cur-rent is being collected at the higher potential. When themotors are on the low-voltage trolley the contactors are inthat circuit. Hamburg-Blankenese-Ohlsdorf Railway Improvements—High-Tension and Low-Tension Collector control circuits, through the compressor fuse and com-pressor contactor to the motor, from which it is led togrounding busbars on the low-tension panel. The com-pressor contactor will be discussed later. The control circuit passes from the two panels men-tioned through switches and fuses to the controller. Ifthe controller is in the off position the control circuit isbroken. The various pieces of apparatus receive controlcurrent over two cylinders in the controller. The currentwhich goes through the larger of these cylinders passes. Hamburg-Blankenese-Ohlsdorf Railway Improvements—Stator and Rotor of New Single-Phase Motor through the contacts of a snap-finger or dead-mans button,the current being interrupted whenever the button springsup. This cylinder also supplies current to the reverser overthe contacts of the reverse cylinder whenever the latteris in the full forward or backward position. If the reversecylinder is in a half-way position the reverser receives con-trol current direct without the intervention of the main October 23, 1909.] ELECTRIC RAILWAY JOURNAL. 901 cylinder and dead-mans contacts. Hence the reverser willtake the proper position as soon as the reverse cylinderreaches the half-way point. The reverser has two magnetcoils, one for forward running and the other for reverserunning. The control current circuits, which run to the connectionboard in the first half of a motor car, pass through a so-called group release. The function of the latter is to cutout all contro
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