FLOOR holes bored for the saw should be filled in – plastic wood should be used if available – before the board is screwed down.

Patching a Worn Floor

The old boards can have pieces cut out of them in the manner already described. The new parts will need bevelling at the ends to make a tight fit. Alternatively, the board may be chiselled through over joists. A V-shaped groove is formed, with a vertical face on the line of the cut and the other sloping towards the waste, in which it is widened until the joist is reached. The new board will be able to bed firmly on the joists at its ends.

Force Pump, An Easily Made. The pump has no metal parts whatever, except a few screws, pins, and washers.

Two blocks of hard wood – beech or oak – 5 inches long and 3 inches wide, are needed. The body piece is 2 inches thick, and the cover piece inch thick. Both are planed up smooth and true, and they should make a good flat fit when placed together.

To ensure a neat job, it is better to make the cover a little larger, secure it to the body by six screws , and plane the edges down to the exact size of the body. The screw-holes in the cover must be large enough for the shanks of the screws to pass through them freely.

The cover having been fixed to the body, a hole li inches across and 2 inches deep is bored with a centre-bit, centred If inch from one end, through the cover into the body. The lower part of this forms the barrel of the pump. The cover is then removed, and a 1 J-inch hole, centred 1½ inches from the other end, bored to the same depth. Melted paraffin wax rs then poured into the holes to a depth of ½ inch or so, and flattened down while warm with a metal disc – a worn coin does very well.

A horizontal hole, n, is drilled, as shown, and plugged with a wooden plug p. Central holes are drilled through the wax to connect barrel and delivery valve chamber, that in the barrel being continued into a groove, G, cut across the bottom of the body.

The valves v1 and v2 are circular patches of thin sheet rubber, pinned into the wax.

This pump has no piston, its place being taken by a stout rubber diaphragm, which is part of a sheet of the same sizo as the blocks. A piece cut from an old inner tube of a car tyre does excellently. The rubber is pinched tightly between cover and body by the six screws. To prevent it being cut, the edges of the barrel and cover should be rounded off.

The diaphragm is secured to the end of the plunger by a round-headed screw, passing through washers on each side of the rubber. The edges of the washers should also be rounded off.

To prevent water swelling the parts, it is advisable to soak them all in hot melted paraffin wax, before the wax is introduced into the large holes. The inside of the latter should be liberally coated.

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