2223. Vegetable Cement

2223. Vegetable Cement. A good vegetable cement may be prepared by mixing gum-arabic with nitrate of lime. The latter is prepared by dissolving an excess of marble in nitric acid, and filtering. The filtered solution will contain 33.3 per cent, nitrate of lime, which may be dried by evaporation. For the cement, take 2 parts by weight of the nitrate of lime, 20 parts pulverized gum-arabic, and 25 parts water. The mixture can be further diluted to adapt it to the uses to which it is to be applied. In the manufacture of artificial stone, a cement of a similar character has been found to serve a good purpose. Something of the kind is used in the Frear stone, but in the B'eton-Coignet no additional binding material is found necessary.

2224. Cement for Leaky House Hoofs

2224. Cement for Leaky House Hoofs. Take 4 pounds resin, 1 pint linseed oil, 2 ounces red lead, and stir in pulverized sand until the proper consistency is secured, and apply it warm. This cement becomes hard and yet possesses considerable elasticity, and is durable and waterproof.

2225. Engineer's Cement

2225.    Engineer's Cement. Mix ground white lead with as much powdered red lead as will make it of the consistence of putty. This cement is employed by engineers and others to make metallic joints. A washer of hemp, yarn, or canvas, smeared with the cement, is placed in the joint, which is then screwed up tight. It dries as hard as stone. This cement answers well for joining broken stones, however large. Cisterns built of square stones, put together, while dry, with this cement, will never leak or require repair. It is only necessary to use it for an inch or two next the water; the rest of the joint may be filled with good mortar. It is better, however, to use it for the whole joint. (See No. 2169 (Red Lead Cement for Face Joints).)

2226. Plumbers' Cement

2226.      Plumbers' Cement. Melt 1 pound black resin, then stir in 1 to 2 pounds brick-dust. Sometimes a little tallow is added.

2227. Red Cement

2227.    Red Cement. The red cement used for uniting glass to metals is made by melting 5 parts black resin with 1 part yellow wax, and then stirring in gradually 1 part red ochre or Venetian red, in fine powder, and previously well dried, This cement requires to be melted before use, and it adheres better if the objects to which it is applied are warmed.

2228. Turners' Cement

2228.    Turners' Cement. Melt together bees' wax, 1 ounce; resin, 1/2 ounce; and pitch, 1/2 ounce ; stir in the mixture some very fine brick-dust to give it a body. If too soft, add more resin; if too hard, more wax. When nearly cold, make it up into cakes or rolls for use. Used for fastening wood on a turner's chuck.

2229. Temporary Cement for Opticians, Jewelers, etc.

2229.    Temporary Cement for Opticians, Jewelers, etc., A temporary cement to fix optical glasses, stones, jewelry, etc., on stocks or handles for the purpose of painting, repairing, or ornamenting, is made by melting together at a good heat, 2 ounces resin, 1 drachm wax, and 2 ounces whitening; with this applied to the article when heated, a secure hold may be obtained, unfixed at pleasure by heat.