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Thus, by substituting the known values and solving equations 3-9 and 3-11 simultaneously, an equation is obtained which expresses the necessary relationship between the initial piston velocity Vi and the piston weight Wi. This equation can be satisfied by an infinite number of pairs of values for Wi and Vi and the problem is to select the particular pair of values which best suits the practical requirements of the gas mechanism design. To aid in making the selection it is advisable to tabulate the

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