Taggart, William Scott · London : George Routledge & Sons, Ltd. · leaf 102
ing three systems oflevers, but the student will readily see that they are simplyvariations of one system, and all arrangements are covered bythe simple rule. The weight x its distance to the fulcrum isequal to the pressure x its distance to the fulcrum. Example.—A safety-valve is 3 in. dia. The… … Area of valve = 3x3 XTT 9x3-1416 sq. m. 4 4 T- . 1 1 9 X 3i4i6 X CO lb. ,, 1 otal pressure on valve = -—-— = 35343 lb. 4 P = 353-43 lb. P xj = W X X 353*43x3 = 53 lb. .. weight to be hung at W = 53 lb. Example.—Four calender-rollers of a lap end are weighted as shown inthe sketch (Fig. 140). The…
Textile machinery
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