A Practical Treatise on Handrailing Author:George Collings Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: PLATE III. 8. This Plate shows the method of getting out the mould for a handrail where there is a quarter- space of winders connecting straight flights. F... more »ig. 1 represents the plan of such an arrangement, and the whole width of the rail is laid down to the springing lines of the curve. In the quarter circle the centre only of the rail is drawn, and this is enclosed by the tangents 1 2 and 2 3. Fig. 2 is the development, or stretch-out in elevation, of the centre line and the tangents of Fig. 1. Draw the vertical lines at the same distance from each other as the points 1, 2, 3 of Fig. 1; also the risers as they occur on the centre line, and the tangents of the plan, with the flyers above and below. The pitches for the straight rail are drawn as previously described, the under side resting on the angles of the flyers, and the centre at the distance of half the thickness of the rail. Continue the centre of the upper rail in a straight line to B, and from B continue it downwards to meet the centre of the lower rail, so as to form a fair easing on the same. In cutting out this easing, the stuff should be left full all round until the wreath is jointed to it. The under side of the lower rail is prolonged to the vertical line 1 A. From the point where this line cuts 1 A square over to the springing, 3 c. Then from the point where this square line cuts 3 c to that at which the under side of the upper rail cuts the same line, will be the rise or height at which the wreath should be jointed to the lower rail. The diagonal for the mould is obtained as before described. Thus from the point A, where the centre pitch cuts the springing, draw A E square to 1 A. From E set off E D equal to 1 3 (Fig. 1), and draw D c. Then D c will be the diagonal sought. In order to get ou...« less