. The Street railway journal . crank jaw ateach shifting of the switch; the former is undesirable becauseof obstruction to street traffic, and the latter is a source of de-lay. Under conditions of manual operation and in the absenceof a regular switchman, on the other hand, the motorman fromthe car must alight and operate the hand lever, which obviouslyinfringes on the schedule. An automatic switch operating contrivance enables the mo-torman to operate the switch from the platform of the car whileit is in motion, and entirely without outside assistance. Severaldesigns of automatic track switch
. The Street railway journal . crank jaw ateach shifting of the switch; the former is undesirable becauseof obstruction to street traffic, and the latter is a source of de-lay. Under conditions of manual operation and in the absenceof a regular switchman, on the other hand, the motorman fromthe car must alight and operate the hand lever, which obviouslyinfringes on the schedule. An automatic switch operating contrivance enables the mo-torman to operate the switch from the platform of the car whileit is in motion, and entirely without outside assistance. Severaldesigns of automatic track switches have been devised, em-l)racing operation by both mechanical and electrical types have their merits, but the mechanical species havein general offered less promise of reliability under the un-usually severe conditions of operation to which such a devicewill be subjected. The New York City Railway Company hasaccordingly devoted its attention to the electric type of switch. Plan o^ Conduc-i-or Bars Inswlated Section. FIG. SCHEME BETWEEN TROLLEY CONDUCTOREARS AND SWITCH MAGNETS FOR THE OPERATIONOF THE TRACK SWITCH and has in use several installations of two different manufac-turers of the latter class. One of these was built by the Baldwin& Rowland Switch & Signal Company, New Haven, Conn., andthe other by the American Automatic Switch Company, NewYork. The American switch was described in these columns in theissue of Dec. 19. 1903. A diagrammatic view of the Baldwin &Rowland switch is shown in Fig. i. As will be noted, it em-braces two electric circuits in parallel, one of the common leadsconnecting to the insulated section and the other to the liveunderground conductor or trolley bar on the same side as theinsulated section. In each of the parallel circuits are two oper-ating solenoids A4R and ML, a bridge switch sr and si and asteadying magnet inr and ml. When a car is passing over theinsulated section with power on, the cores CC, which are joinedby a yok
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
