IT would be interesting, if space permitted, to trace the improvements in machining methods and their relationship to the fits and clearances used in moving mechanical parts since the difficulties experienced by James Watt in building his first steam engine. Considerable water had gone over the mechanical dam from that time up to the development of the automobile. Yet, most of us will agree that the development of our modern machining methods has been mainly clue to efforts of the motor car manufacturers to produce a quieter, less costly, and more dependable product.
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