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. 1856 Excerpt: ... but will proceed at once to describe the manner of obtaining the necessary templets, and of working the stone..158. Arrangement of the Courses On a platform draw a straight line equal to the vertical height of the wall at its highest point; calculate how much the wall will batter in this height, and set off the ...
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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. 1856 Excerpt: ... but will proceed at once to describe the manner of obtaining the necessary templets, and of working the stone..158. Arrangement of the Courses On a platform draw a straight line equal to the vertical height of the wall at its highest point; calculate how much the wall will batter in this height, and set off the distance at right angles to the first line, as shown in fig. 64, where a b P is the vertical height of the wall, and b c the amount of batter. Draw RADlUt ROD the face line a c, and divide it into the intended number of courses., When the stone provided for the work runs of various thicknesses, measure the thickest and the thinnest blocks and gauge the bottom and top courses accordingly; set off these dimensions on the face line a c, and arrange the intermediate courses as described in art. 78, Section II. Number the bed-joints as shown in the figure, beginning from the bottom of the wall. Provide a rod, and mark on it the radius of each bedjoint, numbering each joint in succession to correspond with the numbers on the line a c. 159. To work the top Bed.--The beds of the courses of a battering wall are made to dip at right angles to the face, whilst their front arrises lie in horizontal planes. The first operation therefore will be to form a horizontal surface of operation on which to apply a curved templet, cut to the radius of the front arris. Fig. 65. Make a bevel, as shown in; fig. 65, so that the angle ab c: shall be the dip of the bed. / N, The length of b c will be regu.!-EArLL_L-_-k -ax_ iate( by the width of the stones of to be worked; that of a b by if/ their length--the width, d e, of / the rectangular portion, a d ef, is of little, consequence; 3 inches is a convenient dimension. Call this bevel No. 1. It will apply to the wh...
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