Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 405
e from edge to edge, as at A. Then 392 Steam Engineering A—B-^2=the outside lap. For instance^ A=8.5 in., B=Q.^ in. Then 8.5—6.5=2, and 2 divided by 2=1 in.,which is the lap. The inside lap should also be measuredat this point for convenience, and the measurements pre-served for future reference.… … difference by 2.E is 3 in.; then Fig. 134 For instance, the distance F is 4 in., and ! 3 :.5 in., making the inside lap ^/2 in. 2 To place the valve central, measure the width of theoutside lap each way from the outside edges of the steamports and mark the points on the valve seat with a sharplead…
