larged details of the breast.summer carrying the floor across the bay window are given in Fig. 4. This is composed of three 9 in.X3 in. deals bolted together and stub mortised to receive the tusk tenons on the joists as shown. The transverse sections, Figs. 2 and 3, are projected from the plan on the given section lines.
Windows.—A cased sash frame with 2 in. double-hung ovolo moulded sashes is shown on page 66, with enlarged details on page 68. Two methods of construction are given on page 66: the left-hand lialf-elevation and plan, also the vertical section, Fig. 2, showing the method employed in superior work, all the parts being grooved and tongued together. A framed window back is shown below the sill, with an architrave moulding fixed on moulded grounds and plinth blocks. The section is shown broken for want of space, but the student should re-draw it in full height as figured. The right-hand half-plan and elevation show the construction of a common frame simply nailed together. There is no wood window back in this case ; the wall runs straight across under the sill, and is plastered, and a wide window board is used on which the architrave stops. The brick reveals on each side show successive courses.
The superior trame is shown fitted with a ventilation piece or wide bead, tongued to the sill; this allows the bottom sash to be opened for ventilation between the meeting rails without causing a draught at the bottom. In common frames, the usual § in. or | in. guard bead is made J in. wider than the side ones, and is bevelled to enable the sash to clear freely.
In drawing the frame, start with the plan, then the section; the sizes of the opening should first be set off from page 66, then the frame " built in from the enlarged details given on page 68, working inwards from the brickwork. The chief dimensions are : linings. 4J in. 1 in.; sashes, 2 in.; pulley stiles and head, ij in.; oak sill, 3 in. (twice weathered and throated and three times e
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