The Orthogonal System of Hand-Railing, with Practical Illustrations of the Construction of Stairs
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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. 1850 Excerpt: merely to determine the form of the wreath between these points. This was formerly done by the application of a mould, termed a falling-mould, to the vertical sides of the wreath. But a little attention will enable the student to dispense with the use of the falling-mould for this purpose altogether. The falling-mould has, however, to be employed in the construction of a wreath. CONSTRUCTION OF THE FALLING-MOULD. 42. In the construction of the face-mould of a wreath, it is necessary to develope the nosing line of the steps upon a plane, for the purpose of obtaining the different heights through which the wreath passes. The nosing line is constructed over the middle line of the plan of the wreath, and the figures formed by lines drawn at half the thickness of the hand-rail distant from each side of it is termed the fallingmould. The shaded figure E L D F, fig. 4, plate 1, is a fallingmould, constructed over quarter-spaces, where the developed middle line of the plan of the wreath that winds around the end of a quarter-space is equal in length to the breadth of a step. The falling-mould produced under these circumstances is straight, it is therefore in its most simple form. Where angles occur in the nosing line, the falling-mould is formed into gently undulating curves, termed easings; these easings are effected in the same manner as the easings of the stringboard, shown at fig. 4, of Part L 43. In fig. 4, plate 1, A B C is the plan of a wreath, the lines 1, 2, 3, 4, 5, are the risen lines of the steps, 2 3 and 3 4 are the quarter-spaces, and the lines A, B, and C, are the plans of the joints of the wreath. It is necessary to determine the places of the joints upon the falling-mould for the purpose of accurately constructing the face-mould: --Produce the middl.
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