. Locomotive engineering : a practical journal of railway motive power and rolling stock . ame polarity, it will have the effect ofmaking the two magnets act as one mag-net, the iron projection P between the twocoils now becoming the pole piece, and thearmature, in consequence, will be at-tracted. From this it is seen that theremust be two circuits to work the magnetsof each machine—one from the main linebattery of one instrument, closed by press-ing on the key S; the other an entirelylocal circuit, closed by turning the indica-tor handle H of the other instrument. A galvanometer G (Fig. 15),
. Locomotive engineering : a practical journal of railway motive power and rolling stock . ame polarity, it will have the effect ofmaking the two magnets act as one mag-net, the iron projection P between the twocoils now becoming the pole piece, and thearmature, in consequence, will be at-tracted. From this it is seen that theremust be two circuits to work the magnetsof each machine—one from the main linebattery of one instrument, closed by press-ing on the key S; the other an entirelylocal circuit, closed by turning the indica-tor handle H of the other instrument. A galvanometer G (Fig. 15), placed incircuit with the main line wire, serves toinform the operator, when he wishes towithdraw a staff, when the operator at theother instrument has pressed down thekey S and closed the main line indicator/, placed on the left side ofthe instrument, is used to designate from which instrument a staff has been with-drawn, and also, when turned cleararound, to break the main line circuit,allowing the galvanometer needle to returnto a vertical position, and thus notify the. A Stafk Lock. other operator that the staff has been re-moved and he can release the key. Asingle-stroke bell, placed in the main linecircuit, rings each time that the ke\ of theinstrument at the other station is staffs (shown inj Fig. 13) are madeof a piece of iron pipe, name plates of thetwo stations at the ends of the block beingriveted on the end. The rings riveted tothe staff serve as projections to fit in be-tween the wings of the drum D (Fig. 14),to raise the several latches, as well as tomake it impossible to place a staff takenfrom the instrument of one block into theinstrument belonging to the next number of staffs provided for each in-strument is usually ten, but as many maybe used as will go into onemachine. The operation of the in-strument is as follows, sup-posing that A and B represent there is no train in the block, by pressingon the key 5 (Fig. 15), sending
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
