International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 318
y a force ;/ /*, actingin a direction // /at right angles tc^ the side b d oi the tri-angle, i. e., at right angles to the vertical back b d oi thewall, its center of foree being at P distant ^ way between band d, measured from the bottom of the wall d. The amountof this force is expressed by the… … Fig. 4u(i, as in Fig. 4U5, but to those with inclined backs, as in Fig.406, for inclinations as high as 6 inches horizontal to 1 footvertical, which is rarely met with and never exceeded. 1487. Friction Caused by Pressure of Back-injtr.—If all the backing material contained between theline of…
Railroad engineering
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