Modern locomotive engineering, with questions and answers .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & co · leaf 131
Figure 59 The object of giving a valve lead is that the steamport may be opened slightly for the admission of livesteam just before the piston reaches the end of itsstroke, in order that there may be a cushion of steamto receive the piston and re\erse its motion at the end … Figure 60 ^f the stroke, thus making the engine quicker in itsaction. Lead increases on a locomotive as the cut-off13 made earlier or shorter, which is done by bringingthe reverse lever nearer the center notch of the quad-rant. The increased lead is caused by the radius of VALVES AND VALVE GEAR 125…
Locomotives
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