Practical sheet and plate metal work : for the use of boilermakers, braziers, coppersmiths, ironworkers, plumbers, sheet metalworkers, tinsmiths, whitesmiths, zincworkers, and others ... by Atkins Evan A. (Evan Arthur) 1864-1940

Author:Atkins, Evan A. (Evan Arthur), 1864-1940
Language: eng
Format: epub
Tags: Sheet-metal work, Plate-metal work
Publisher: London ; New York : Whittaker & Co.
Published: 1908-03-25T05:00:00+00:00

ROOFING WORK

235

now set to twice the length I rn, and the points L stepped around the arc. It is a good plan to mark off one side more than is required (in this case seven), and then bisect the two end parts to obtain the seam exactly up the middle of a side. These joint lines are marked T M in the figure. The line T t' will give the radius for cutting off the points to form the inside part of pattern shown by the lines 11.

In making up the finial the strips should first be bent to the required shape of section—that is, the centre line of the strip should be formed to the outline in the elevation (Fig. 195). The strips are then all tacked together with solder, and after carefully testing the finial to see that it is symmetrical and without twist, the joints soldered up, as much of this being done from the inside as possible.

Downspout Head.

A downspout or hopper-head lends itself admirably for treatment by ornamental work in sheet zinc or galvanised sheet iron. In this case, as in the last, the shape of moulding chosen may be of any section to suit the individual taste and estimated outlay. A simple design is that shown in Fig. 197; its form in plan being that of the five equal sides of an octagon. Fig. 197.

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