The most general school-assistant; Containing, a complete system of arithmetic the common and useful problems in practical geometry the methods used ... kinds of superficies and solids, of artific - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1770 Excerpt: ... Foundations must be done before the BrickWork can be begun: Also tha this Digging is done by the solid Yard: And that the Dimensions in Digging are seldom taken nearer than a Quarter of a Foot. Bricklayers Work, properly speaking, relates only to Work done with Bricks, and is commonly estimated by the Rod of 272! square Feet. This Work tho it hath its Contents given in square Measure, is nevertheless, of various Thicknesses; so that if Contents were to be reckoned according to their Surfaces, in all Thicknesses, there must be a manisest Injustice done to some one, both with respect to Time and Materials: To prevent this, there is a particular Thickness fixed on to estimate this Work by, called the Standard Thickness; and this this S andard is the Length of one Brick and Half, or three Times the Breadth of a Brick: So to estimate this Work observe this Rule: Multiply the superficial Content of the Wall in Feet, by the Number of Half Bricks in its Thick, ness; one Third of this Product is the Content in Feet, at the Standard Thickness. Hence the Parts of a Wall,' or a Building, which are of different Thicknesses, must be taken and reduced separately. 241. Ornamental Work: Such as Arches over Doors, Windows, &c. Facias, Architraves, Rubbed Returns, Friezes, Cornices, Rustic?, &c. Piers, Columns, Pilasters, &c. are valued by the Square Foot: By Ornamental Work, in common, is meant such as is ground, gauged, ox polished: But if by Ornamental Work, carved Mouldings &c. is meant, it is necessary to observe, that such is often done by running Measure. In taking Dimenfions of Ornamental Work, which hath its Content found in square Measure, the Length is measured where it is greatest; and for the Height or Breadth, it taken both the Surface and Soffi...
"synopsis" may belong to another edition of this title.
