. Canadian forest industries July-December 1919. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 48" Heart 3-ply Belt, 86 feet long, instal- led in 1911 in the mill of the C. A. Smith Lumber Com- pany, Baypoint, Cal. Driving pulley, 14 feet. 101 R. P. M. Driven Pulley, 4 feet. Belt Speed, 4,400 F.P.M. Theo- retical horse-power, 600. Actual horse- power transmitted, 850 to 900. Cost of Belt, 1/5 of Ic per h o r s e-p o w e r per Week. "Where Little Things Are Big 99 Think what this belt must do. Traveling at 4400 feet per minute, it makes i
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. Canadian forest industries July-December 1919. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 48" Heart 3-ply Belt, 86 feet long, instal- led in 1911 in the mill of the C. A. Smith Lumber Com- pany, Baypoint, Cal. Driving pulley, 14 feet. 101 R. P. M. Driven Pulley, 4 feet. Belt Speed, 4, 400 F.P.M. Theo- retical horse-power, 600. Actual horse- power transmitted, 850 to 900. Cost of Belt, 1/5 of Ic per h o r s e-p o w e r per Week. "Where Little Things Are Big 99 Think what this belt must do. Traveling at 4400 feet per minute, it makes its circuit fifty times every sixty seconds. For every one of these revolutions, each part of the belt must slacken and tighten itself, practically once a second. To be efficient, it must do this without loos- ening its grip on the pulleys, without jumping or slipping. That this 48" Heart Belt does transmit power efficiently is evidenced by the fact that it is delivering 250 more horse-power, or over 40% in excess of that for which it had been designed. It has been doing this for over 8 years. The test of such conditions seems impos- sibly severe, and yet this belt succeeds because it is made from the right material—leather— which has retained so many of the wonderful properties that fit it to be the skin of a power- ful, active, living animal. In order that our leathers may meet these almost impossibly severe requirements of elas- ticity and pulley grip, we tan them ourselves specifically for belting use, handling 1, 000 hides a day. That we may ofifer always the right belt for the required work, we make our Standard Series of Leather Belting—a Belt for each class of power transmission. Standardized in manufacture and standardized in application to the work to be done. Many of the best belted plants ask us to specify the belting for every pulley drive. Try the plan yourself. Then, when buying, call for "Graton & Knight Brand or equal." This won't commit