Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 509
F is equal to the sum of the lap and the lead.When the cranii is on a dead centre, the point B will be in its extreme position,and assuming the block R is in the centre of the link, then the point V will havemoved the valve a distance equal to the lap and the lead from its mid-position,and the port… … Fig. 482. is equal to FR, the block R may be moved from one end of the link to the otherwithout changing the position of the point F or the point V. Hence for allpositions of the block in the link the valve is in the same position when thecrank is on a dead centre, or the lead is constant. The…
Steam-engines
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