. The railroad and engineering journal . pening andcut-off at each end of the valve, in the manner describedand illustrated. In Jacksgear, No. 4,167, of 1885, we have accomplished,by the introduction of an extra swing-link, what Hack-worth did by his slide-bars—viz., the fulcrum-pin Z) con-strained to travel in a straight line. Fig. 19 is a diagramof the same, where it will be observed that fulcrum-pin D swings not only from point C, but also from point/, theneutralized action constraining D to move in a straightinstead of a curved line. It is strange that Jack has not applied it to a lever of
. The railroad and engineering journal . pening andcut-off at each end of the valve, in the manner describedand illustrated. In Jacksgear, No. 4,167, of 1885, we have accomplished,by the introduction of an extra swing-link, what Hack-worth did by his slide-bars—viz., the fulcrum-pin Z) con-strained to travel in a straight line. Fig. 19 is a diagramof the same, where it will be observed that fulcrum-pin D swings not only from point C, but also from point/, theneutralized action constraining D to move in a straightinstead of a curved line. It is strange that Jack has not applied it to a lever of thesecond order as well, as he only claims : In the gear toroperating the valves of motive-power engines, the mount-ing of the eccentric-rod upon a pin, at from one-third toone fourth of the distance between the center of //and ofthe eccentric, the same being combined with a parallelmotion constructed and operating as described. Sisson, in 1885, in his Patent No. 6,254, brought outgear of the same class as Joys, with the compensating.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
