Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 389
Fig. IIS the width of each steam port to be 1% inches and the out-side lap to be 1 inch. In Fig. 118 the valve is at the ex-treme end of its travel towards the right and is about toreturn. It first covers port number one=li4 inches. Nextit moves to mid travel lap number one—214 inches. Itsnext move… … Fig. 119 uncovers port number two=41/2 inches, which is its travel.To return to the third function of the valve or cut off,Fig. 119. The crank has now traversed 120°, and the high-est point of the eccentric is at 60° on the return circle, apoint equivalent to 240° of the circle described by…
