Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 600
sulphite of silver being formed, it has to be dissolved out of the paper, thefibres of which hold it with a strong capillary force; and it is only by very long continuedsoaking that all can be removed. The slight mechanical aid afforded by dapping the surfaceof the paper with a soft sponge well… … TiiE science of Perspective is the representation by geometrical rules, upona plane surface, of objects as tliey appear to the eye, from any point ofview. All the points of the surface of a bodyare visible by means of luminous raysproceeding from these points to the eye.Thus, let the line A B (fig.…
