. American ENGINEER and Railroad journal . la motion est ensuite transférée à et à laquelle le ressort hélicoïdal résiste. Le mouvement de la tête du coupleur tournant autour de son pivot est également transféré à ces leviers par les côtés de la cavité dans la tête entrant en contact avec l'elever et le déplaçant contre la résistance du ressort. Ce ressort sert de centreur pour la barre d'attelage et la tête de coupleur. Pour éviter tout problème avec les raccords de désaccouplement lorsque le solarge présente un certain mouvement, ils ont été rasés à un levier coudé pivoté autour de la barre de traction intérieure

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. American engineer and railroad journal . the motion is then transferred to andresisted by the helical spring. The motion of the coupler headin rotating about its pivot is also transferred to these levers bythe sides of the cavity in the head coming into contact with thelever and moving it against the resistance of the spring. Thusone spring acts as a centering device for both the draw bar andthe coupler head. To prevent trouble with the uncoupling connections when solarge an amount of motion is provided for, they have been car-ried back to a bell crank pivoted around the inner draw barpivot and by a series of bell cranks and rods, connection is madeto the head and the uncoupling shaft from this point. The steamand air pipes are also connected so as to allow a certain amountof lateral motion and prevent interference with the coupler. Theyare connected, as is shown in the illustration, by a cast steel yokehaving a bearing in lugs secured to the center sills and span-ning the draw bar. Helical springs are arranged to keep this. FRAME—SIX-WHEEL TRUCK.I out binding. The details of the design are shown in one of theillustrations. It will be seen that the draw bar is pivoted to theyoke at its inner end and to the coupler at its outer end. Thesocket in the coupler head in which the draw bar enters ;s broadenough to allow considerable radial movement of the couplerhead. Within this socket pivoted around the same pin are twolevers, the outer ends of which extend back and rest on a bear-

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