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Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Acknowledgments are hereby thankfully given for corrections and suggestions in the text made by the following persons: Mr. Chas. W. Weick of Teachers College, and Mr. W. F. Vroom of Public School No. 5, of New York City, for revision of Chapters IV and V on tools and fastenings.