Man Using Lever and Fulcrum to Lift Rock Small 320×195 Medium 640×390 Large 1024×623 Download TIFF Original 2400×1461 | (332.8 KB) Description "In mechanics, the word 'machine' signifies an instrument for the conversion of motion or the transference of energy." -Avery 1895 Keywords energy, lever, machine, simple, transfer Galleries Levers Source: Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 127
