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 526
according to the ordin-ary rules for valve setting, by the marks placed on the endsof the valves and valve chests. These diagrams are in-troduced especially for the purpose of showing the need of Diagram Analysis 513 exercising the greatest of care to prevent dirt or grit ofany kind from getting… … Fig. 199 obtained. It showed the valve adjustment to be verynearly correct, but the perfectly straight steam lines, andthe sharp corners and sudden drop at cut off were a puzzle,especially in an old engine where the valves and valve seat*
