ELEMENTS OF MECHANICAL DRAWING. USE OF INSTRUMENTS, GEOMETRICAL PROBLEMS, AND PROJECTION. BY GARDNER C. ANTHONY, A.M. PROFESSOR OF DRAWING IN TUFTS COLLEGE; DEAN OF THE BROMFIELD-PEARSON SCHOOL; IN the preparation of this book, and others of the TECHNICAL DRAWING SERIES, it is the aim o the author to provide text-books rather than copy-books; treatises in which principles shoul be established, and methods suggested, but freedom permitted in their application. While th treatment of much of the subject is new, it has long since passed the experimental stage, an nothing is here published that practical experience in the class-room has not justified. The THIRD ANGLE OF PROJECTION is used exclusively, as is required in all good practice, an the terms TOP and FRONT VIEW have been substituted for PLAN and ELEVATION by reason of th confusion arising from the use of the latter. The methods employed for the representation o objects oblique to the planes of projection have been found to give a clear and comprehensiv understanding of a subject which is usually much encumbered with rules, soon to be forgotten The introduction of a graphic statement of problems relieves the instructor of the mechanical and frequently laborious, task of devising suitable problems, with proper dimensions, and enable the student to begin the drawing without delay. The treatise on Screw-Threads and Bolts is the embodiment of instruction and problems given to classes during the past six years, and is a introduction to the study of machine drawing, as treated in the second book of the series. |