Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 387
ious terms re-lating to valve action are plainly defined in the section on^^Definitions/^ and it is unnecessary to repeat them here.If the outside lap is increased admission will be later andcut off earlier^ and if it be desired to keep the lead thesame it will be necessary to ifiove the eccentric… … ^These propositions refer mainly to engines of the singlevallve variety in which one valve controls the admission anddistribution of the steam .for both ends of the cylinder.In engines of the four-valve type^ having a separate steamand exhaust valve for each end of the cylinder, each in-dividual…