Excerpt from Principles of Engineering Drawing for Technical Students
The subject matter of this text has been carefully prepared and arranged with a view to meeting the needs of Freshman students in Engineering Schools and Colleges. It contains, in addition, ample material for the requirements of more advanced men who are interested in Engineering Drawing.
The ability to use engineering drawings intelligently presupposes the power to make mental translations from orthographic projection drawings into perspective, and from perspective back to orthographic, as these processes are constantly taking place in the various departments of manufacturing plants engaged in engineering construction.
Under the theory that as a boy grows up he develops a natural tendency to visualize objects in perspective form, the author has made use of angular perspective as a means of introducing the subject of orthographic projection, believing that a sound grasp of the latter subject may be obtained by comparing it with a known subject.
After the fundamentals of both perspective and orthographic have been studied thoroughly, we apply this instruction immediately when taking up freehand sketching, for here the student is required to use his reasoning faculties to translate perspective sketches into freehand orthographic projection drawings.
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