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The authors desire to express their very, sincere thanks to Mr. F. B. Gilbreth for permission to use four of his photographs as illustrations, and to Mr. J. F. Butterworth, Mr. Gilbreth's general representative in England, for considerable assistance and helpful criticism. They are also glad to record their gratitude to Mr. H. W. Allingham, M. I. M. E., to whom they owe their introduction to Efficiency Methods, a good deal of information, and the opportunities they have had of seeing the system in operation, and (one of them) of working under it. Practically all the important books of...