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 654
(see Fig. 269) by which one or more nozzles canbe cut out when the load is light. This renders it possibleto use steam at boiler pressure, no matter how small thevolume required for the load. This is a matter of greatimportance, especially where the load varies considerably,as, for instance, there… … Fig. 272 642 Steam Engineering the number of nozzles in action may be reduced b}^ closingthe slmt-off valves until the required volume of steam isadmitted to the wheel. This adds to the economy of themachine. After passing through the nozzles^ the steam^as elsewhere explained^ is now completely…
