Third Kind of Lever

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“In the third order of lever the power acts between the prop and the resistance, where also P : W :: BF : AF, and the pressure on the fulcrum is P-W, or the power less the weight."——Pettigrew, 1874




Rawson, W. W. Success in Market Gardening: A New Growers' Manual (Boston, MA: W.W. Rawson, 1892)


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