1. Descriptive Geometry has two objects: the first to give the methods for representing on a sheet of paper which has but two dimensions, length and breadth, all the bodies of nature which have three, length, breadth, and depth, provided that these bodies are able to be rigorously defined.
The second object is to give a means of knowing, through an exact description, the forms of bodies and to deduce all the resulting truths from their forms and their positions respectively.
We are going to indicate firstly the procedure, which has come to light through long experience, for fulfilling the first of these two objects. After this we shall give the methods for fulfilling the second.
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