PLATE XXXII.
SHOWING THE MOULDING OF RAILS, AND A METHOD OF
PROPORTIONATELY INCREASING OR DECREASING THE SIZE OF THEM.
Figs. 1 and 2 show pattern of rails full size, both of which look well when finished, and nice to handle. The shaded parts at Fig. 1 show how the rail should be worked out before it is moulded. It will be seen that Fig. 1 has three dowels, while Fig. 2 has two.
At Fig. 2 is seen a method by which a rail may be proportionately increased or decreased to any size. Let S be the given rail and R the required one. Make A B equal the width of S, and A E the thickness of R; from E draw square to A B, and make E F equal the thickness of S; join A B. From A square out a line and make A D equal the width of the required rail R. From B and D square out lines to meet in C; join A C. From each member in S draw ordinates to cut A C and A F, and where these meet again in R will be the same member in the required rail.
Fig. 3 shows a handrail screw, A being a round nut, a section of which is seen at Fig. 4, and B a square one; W is a round washer. These screws are let into about the centre of the section of rail at the joints. A hole is cut in the under side of each piece for the nuts to go in, and a small bent chisel, made for the purpose, is used to turn the nut A.
LONDON:
PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, STAMFORD STREET
AND CHARING CROSS.