A Rudimentary and Practical Treatise on Perspective for Beginners; Simplified for the Use of Juvenile Students and Amateurs in Architecture, Paintin

A Rudimentary and Practical Treatise on Perspective for Beginners; Simplified for the Use of Juvenile Students and Amateurs in Architecture, Paintin

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1852 edition. Excerpt: ...place it upright before us; the relative positions of the spectator and board being as A B (Fig. 5); A representing the position of the spectator, and Fl 5" B the base of the board, the board itself standing perpendicularly over this line; the line from A to B representing the direction in which the board is viewed. In such a position, the simple geometrical form of the square (or whatever form it may be) would be apparent, A If the strings were brought to a point on any other part of the line c P, the result would be the same. and this would be the same at whatever distance it may be removed, so long as the board stands at a right angle with the direction of the line from A to B in which it is viewed; the change of distance affecting only the apparent size of the object, but the form always remaining the same: but if the angle at which the board stands with reference to the line from A to B is in the slightest degree changed, an apparent change of form is the immediate consequence, as we will endeavour to point out by the following diagram (Fig. 6). In this figure, let the square abed represent a closed shutter, opening by hinges on the side a b, viewed from the point A in the direction A e b. If this shutter were opened, so as to lay it against the wall to the left, the edge d c must necessarily describe a semicircle in its passage from d to /, as shown by the line d e f. In the passage of this shutter from its first position, closed over the line d b, to its full opening over the line b /, it assumes an infinite variety of forms. In its first position we see the outside, and in the last the inside, of the shutter; and as in both these positions the shutter stands at a right angle with the direction of the line (a e b) at which it...show more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236522877
  • 9781236522870