International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 319
dry sand and earth may slide freely over it, andtaken at 33° 41 with the horizontal. Draw ;/ h perpendicu-lar to ;/ /-and complete the parallelogram // Ji k P. Then,/(Pwill represent to the same scale the amount of frictionagainst the back of the wall. As the friction acts in the di-rection of the… … k /acting at P. By composition and resolution of forces,the diagonal // /measured to the same scale will give us theamount of their resultant, which is approximatel}^ Xht. single X a^^b__o ^_t hcorctical force both inamount and di-rection whichthe wall has toresist. Thisforce includest the wall…
Railroad engineering
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