By Herman Haeder
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Extra resources for A Handbook On the Steam Engine: With Special Reference to Small and Medium-Sized Engines ; for the Use of Engine Makers, Mechanical Draughtsmen, Engineering Students, and Users of Steam Power
FRAMES I'OIl Fig. 75. TABLE 4. Engines. MEDIUM AND LAKGE ENGINES. 27 Pig. 70. Feet for supporting Girder Frames (Figs. 75 77). DETAILS OF STEAM ENGINES. * TABLE Engines. 5. Main Bearing Foot (Fig. 78). FRAMES FOR MEDIUM AND LARGE ENGINES. Fig. 79. TABLE H 8 6. t'ig. 80. Sundry Details Fig. 82. Fig 81. for Girder 29 Frames (Figs. 7982). 80 DETAILS OF STEAM ENGINES. FRAMES FOR MEDIUM AND LARGE ENGINES. ft 6C 31 DETAILS OF STEAM ENGINES. 32 Frames for Horizontal Engines with more than One Cylinder.
Too high pressure per unit of surface P. 2. , pv too stiff for great. 3. , shaft too elastic. 4. Unsuitable material for the brasses or steps. 5. Insufficient 6. Blow s or Then means of lubrication. r let jars. i = P = d I p = v = diameter of journal in inches. length of journal in inches. speed in revolutions per minute. total pressure in Ibs. pressure per square inch in Ibs. periphery speed of the journal in feet per second, then, for ordinary engines : p < 270 p ; v ^ 840. figures do not give the limit to which the pressure and speed may be carried, the table gives some examples taken from engines which have been running for some years.
151155. Figs. 158 and 159. Figs. 149, 150, show a form of ordinary crank, formerly made of cast iron ; figs. 151 155, a crank of wrought iron or cast steel ; figs. * This effect is is may be true in some cases, but not very noticeable, especially ED. figs. 182, 184. shown in if if the disc is sufficiently massive the the balance weight is applied as 48 DETAILS OF STEAM ENGINES. 156, 157, a crank disc of cast iron cast iron or cast steel, the ; figs. 158, 159, a crank of either former material is not now nsnch used, except in small cheap engines.