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ADDED FOR FOURTH Angle Nat angle of wrap arc of contact backbone bearings belt dressing belt drive belt speed belt tensions belting butt belting leather capacity cement cent center distance centrifugal force coefficient of friction crossed belt crowning DEGREE Angle determined Diam double belts driven pulley edge effective pull elasticity factor of safety feet per minute fiber flesh side formula FOURTH FIGURE Figure Fourth PROPORTIONAL grain side guide pulleys hide holes horizontal horse power idler drive inch of width increase initial tension lace laps leather belt line shaft load LOGARITHM MANTISSAS Third machine manufacture method modulus of elasticity motor open belt plane plies power transmitted pulley diameters quarter-turn drive radians ratio reverse revolutions per minute running shown Sine Deg single belt slack side slip small pulley specifications stretch strips surface TABLE tensile strength tests thickness tight side transmission waterproof weight