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" projection " on which the art of Mechanical and Engineering Drawing is based. The problems in each division of the subject might have been considerably increased in number, but as such an extension would have involved the expenditure of more of the student's time than the subject warrants, as many have been given as will be found necessary for all his future requirements. A careful study of the foregoing first principles of the Mechanical Draughtsman's art, and the conscientious working out of all the problems furnished for their complete elucidation, will lead the student to an easy comprehension of the method of their practical application to the delineation of all kinds of machine elements, and engine details, which may form the subject of a further work by the author of the present one here concluded. 14 DAY USE RETURN TO DESK FROM WHICH BORROWED LOAN DEPT. This book is due on the last date stamped below, or on the date to which renewed. Renewed books are subject to immediate recall. Mathet THEODO and thefi most Trea T Seleci