. The Locomotive . sion valvefor the head end ofthe cylinder. A simi-lar arrangement isused at the crank endof the cylinder. Inthis sketch A is theend of the valve-stem,which passes throughthe other parts of thegear and into the cyl-inder where it is at-tached to the cylindrical Corliss valve. The valve is actuated bythe oscillation of this valve-stem. Part B is the steam-arm and, aswill be seen, is secured to the valve-stem by a key. The rod C,attached to the steam-arm, is drawn down to the position shownin the sketch by a dash-pot on its lower end which is not illustratedhere. In the positio
. The Locomotive . sion valvefor the head end ofthe cylinder. A simi-lar arrangement isused at the crank endof the cylinder. Inthis sketch A is theend of the valve-stem,which passes throughthe other parts of thegear and into the cyl-inder where it is at-tached to the cylindrical Corliss valve. The valve is actuated bythe oscillation of this valve-stem. Part B is the steam-arm and, aswill be seen, is secured to the valve-stem by a key. The rod C,attached to the steam-arm, is drawn down to the position shownin the sketch by a dash-pot on its lower end which is not illustratedhere. In the position shown, the steam-valve is closed. Thedouble-arm D is machined to a running fit on the valve-stem andhas two arms — one extending to the left and carrying the steam-hook E and the other extending to the right and having attachedto it the steam-valve-rod F. This steam-valve-rod is attached,through a series of levers, to the eccentric of the engine and isgiven a reciprocating motion which changes to an oscillating. Fig. I. 132 THE LOCOMOTIVE. [January, motion in the double-arm. The knock-off-lever G is also machinedto a running fit on the valve-stem and is controlled by the governor-rod H. The governor shifts the position of this knock-off-leverby rotating it about the center of the valve-stem but for any givenload the position of this lever will be stationary. The steam-hook E is carried by the double-arm to which it isfastened by the pin K although motion is permitted between thepin and the hook. A spring L is fastened at one end to thedouble-arm and at the other end exerts a pressure which tendsto rotate the steam-hook in a counter clockwise direction. Thesteam-hook is prevented from turning, however, in the positionshown, because the end of its short leg is bearing against theknock-off-cam M which is fastened to the knock-off-lever G. Starting from the position shown the operation of the enginewould be as follows: The double-arm will rock counter-clockwiseso that the steam
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