. The steam-engine and other heat-motors. ither ahead or backing, the valve receives its motionfrom one eccentric only. As the link is shifted from that positionto those nearer midgear, it receives less motion from that eccentricand more from the other one. At midgear it is affected equallyby the eccentrics. As the gear is shifted towards the other fullgear, the influence of the first eccentric becomes less and less andthat of the second greater. It will be shown that the effects onsteam distribution caused by the change of valve motion producedby this movement of the link are the same as thos
. The steam-engine and other heat-motors. ither ahead or backing, the valve receives its motionfrom one eccentric only. As the link is shifted from that positionto those nearer midgear, it receives less motion from that eccentricand more from the other one. At midgear it is affected equallyby the eccentrics. As the gear is shifted towards the other fullgear, the influence of the first eccentric becomes less and less andthat of the second greater. It will be shown that the effects onsteam distribution caused by the change of valve motion producedby this movement of the link are the same as those produced by aswinging eccentric. REVOLUTIOX COXTROL. 353 On locomotives, owing to the relative positions of the valve(above the cylinder and outside the driving-wheels) and the eccen-trics (on the driving-axle and inside the driving-wheels) a rockerBTA is necessary (Fig. 185). To prevent the reversal of thevalve motion the eccentrics must follow the crank. Hence, if thecrank is at C the center of the go-ahead eccentric is at E, and the.
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