A simple vaporizer which can be used by designers to project their colors in a fluid spray, or by housekeepers to disinfect or perfume their apartments, can be made in the following manner: Two goose quills are forced through holes in a cork at right angles to each other, as shown. Place the vertical quill in a bottle containing the fluid to be sprayed and by blowing through the horizontal quill a very effective spray will be produced.—Contributed by Hazel Kolar, Maywood, Ill.
¶Old wringer clamps, used for holding the wringer to the tub, are very handy around a workbench.
Tooth Powder Used on Tracing Cloth
Tooth powder is an excellent substitute for the powders which are sold for the purpose of preparing the glossy surface of tracing linen to receive ink. The gritty element removes the excess gloss which prevents the ink from taking hold. A second dusting with talcum powder makes a perfect surface for inking in.
A Small Gas Furnace
A small gas furnace for melting small quantities of gold, silver, or other metals, can be easily made as follows: Procure a cylinder of stovepipe iron of the desired size, say 4¹⁄₂ or 5 in. in diameter, and 6 in. long. Turn in the edge of one end so that it will hold loosely a disk of iron of the same thickness as the cylinder, to form the bottom. Punch ¹⁄₈-in. holes, about 1 in. apart, all over the cylinder and the bottom. This is to allow for the escape of moisture and air. Attach three legs to the sides with rivets, evenly spaced so as to raise the bottom 4 in. In the side of the cylinder cut a hole, 1¹⁄₄ in. in diameter, its center being 1¹⁄₂ in. from the bottom. Select a glass bottle whose diameter is 1 or 1¹⁄₂ in. less than that of the cylinder.
Make a putty of fire clay, and add about five per cent of plaster of Paris, and also add about a teaspoonful of vinegar, to prevent a too rapid setting. Place a mass of the putty in the bottom of the cylinder and press in the bottle after its surfaces have been well greased. The bottle should be well centered in the cylinder. Press the bottle well down, so that its bottom is on a level with the lower edge of the hole in the side. Fill in the putty to form the sides, tamping it well all around the bottle, and build it up a little above the metal of the sides, carefully smoothing off the edge. With the fingers, or a spatula of some kind, cut out the putty in the hole to form an opening, ³⁄₄ in. in diameter. Allow the putty to set for more than an hour, and then with a circular, or twisting, motion remove the bottle. To prevent a vacuum in the bottom that will prevent removing the bottle easily, puncture the putty that lies on the disk with a hatpin, to allow the air to pass.
A few places will be found where the putty has not filled in properly, and these should be patched up while the filling is yet soft. The clay will probably shrink after standing for a time, and should be pressed out against the sides while in a plastic state. When dry, the furnace is ready for use.