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Mr. Rollo towards accuracy might be taken. I n his equation (26) Mr. Spiller Appleyord. expressed V, the critical speed of climbing, as a function of to/w, where W was " the weight of wheel and load," and W was "the total weight of the engine ; and in order to interpret V numerically, he estimated the minimum value of W as being W / 15. Next,by assuming that the minimum value of tu/ W, corresponding with this minimum value of to, might be regarded as constant, Mr. Spiller obtained equation (27)doi:10.1680/imotp.1909.17672 fatcat:vogkt47ewzdcdfbkrsnxofwpde