Steam engines, prepared in the Extension division of the University of Wisconsin (1919)
Shealy, Edward Marvin · New York, McGraw-Hill · leaf 271
shaft it would appear to be rough, eventhough as far as the naked eye can isee, the shaft is perfectly27 255 256 STEAM ENGINES smooth. After looking at such a surface through a microscopeand seeing its roughness, it will be realized that when two suchsurfaces are brought together the elevations and… … Fig. 158. there will be considerable friction between the two surfaces. Thefriction in this case would arise from two sources: first, from mov-ing the irregularities on the surface of the journal into and out ofthe irregularities on the bearing surface, that is, the friction dueto the unevenness of…
Steam-engines
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![An illustration from Catalogue des monuments et inscriptions de l'Égypte antique / publié sous les auspices de S.A. Abbas II Helmi par la direction générale du Service des antiquités [de l'Égypte] ; par J. de Morgan, U. Bouriant, G. Legrain, G. Jéquier, A. Barsanti (1894)](https://img.insideoutlibrary.com/img/200/ia-cataloguedesmonu22egyp-50-87.webp)
