Locomotive operation; a technical and practical analysis (1904)
Henderson, G. R. (George R.), b. 1861 · Chicago, Railway Age · leaf 136
separatelyor apart from the Stephenson link motion or the Walschaertvalve gear, but is used in conjunction therewith, so as to delaythe exhaust opening and exhaust closure at all points of cut-off,and to increase the ratio of expansion and decrease the negativework of compression by the reduced… … Fig. 39. represents negative work. If the inside valve clearance be notalreadv excessive, the loop can be overcome by cutting out moreclearance from the exhaust edge of the valve. If this is notpossible, a special cylinder head may be prepared which willcontain additional clearance volume, and such…
Locomotives
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