Chapman, J.G. (John Gadsby), 1808-1889. / The American drawing-book: a manual for the amateur, and basis of study for the professional artist: especially adapted to the use of public and private schools, as well as home instruction.
(1870 [1873 printing])
Chapter I. Primary instructions in drawing., pp. 11-34
CURVED LINES. and expansion of the one to know what it is intended for; but to draw it in its exact proportions, with the sweep of the outline in perfect balance on either side; to make it a true representation of the object, some method must be used. Having fixed upon the height of the glass A B, decide upon the diameter of its base or stand n c~ and that of the top B r. That done, you have sure starting points; and nothing more remains, to complete the outline, than first determining, by your eye, the variation of the curves it presents from these right lines, and expressing them exactly as you have already done in the examples before given (22). WitI~ the straight lines B B-B r to guide you, the gradual taper ~ object is readily expressed by one clear sweep, easily obtained and repeated. 30. The first and greatest difficulty of the beginner will be to find and see these imaginary straight lines in objects presenting, in their form and outline, only irregular curves. This must be acquired by training. By prac- A B C 12 tice and observation, the eye will soon learn to find them out, without mechanical aid. Let him, as a first experiment, for instance, hold a thread, with a alight weight attached to it, at arm's length, between him and an ordinary water-pitcher, or ewer, and he will at once see all the perpendicular lines he desires, drawn, as it were, against the pitcher by the thread. They will show him the relative van- ations of all the ct~rvatures of 4
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