The Practice of Perspective; Or, an Easy Method of Representing Natural Objects According to the Rules of Art ... the Whole Illustrated with One Hundred and Fifty Copper-Plates - Softcover
Synopsis
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. 1743 edition. Excerpt: ...or terzo Acuto, is represented in Figure +z the Diameter whereof, a h, being divided into three equal Parts X, and one Foot of the Compafles set in one of the Divisions, as c, and with the other the Aperturec h taken, the Archh e is struck therewith; then removing the Compasses to d, the Arch d a e is struck, which is an Arch in the third Point as well as the former; and either of them may be used at Discretion. Those in old Gothic Churches come nearest the former Kind. a _ iiiiii E _ _ _me___________________ ____________ Z douce; 4.. ii iii."i i iiii i i i i.ii ii ii.ii iii.. ii i i Wi mc m a r ' a-u-o c-co--_, _ _ _ s'. ii ii yi:. a w' E here add an Arbour of a Garden, the Performance whereof is in all Respects the same. as that of Arches viewed in Front. T H E Circle being somewhat difficult to put in Perspective, requires a Number of previous Lines and Points: To find which the more readily, the first Figure here added is to be understood-, which shews, that to describe a Semicircle upon a Diameter A B, there needs no more than to set' one Foot of your Compasses in the Point C, in the Middle of A B, and with the other to sweep a crooked Line from A to B. And thus is the Semi-circle to be transferred upon the Elevation D E, Fig. II. for a circular Gate or Arch. Now to put it in Perspective, it is to be divided into any Number of Parts, and the more the better-, as already observed in Pog. 28. and as we shall hereafter have occasion to shew, when we are speaking of cross Vaults, The present Semicircle we shall only divide into four, and that by drawing a Parallel to A B, raising itin the Point F, which Point will be the Middle of the Semi-circlez then erecting two Perpendiculars from'A B, cutting the Parallel F in the Points G H,...
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