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French Waterproof Felting

This composition, heretofore regarded as a secret in France, has been adopted for use in the French navy. The information regarding this material was furnished by Mr. Parent are to be dried by the application of heat, or in the air. The solvent evaporates, leaving the paper or other substance saturated with paraffine impermeable to water, and capable of resisting the action of acids. Articles of dress, such as paper collars and wristbands, should be subjected to selves. to the "Journal of Applied Chemistry." The the action of a flat-iron or heated cylinder, in inoxidizable compound for waterproof is made order to give them a high degree of polish. thus: 100% parts, by weight, India rubber, 175 The applications of this process are manifold, parts finely sifted sawdust, 10 parts powdered and new ones are constantly suggesting themones are constantly suggesting themsulphur, 25 parts slacked lime, 125 parts sulphate of alumina, 125 parts sulphate of iron, 1559. Balard's Waterproofing for 10 parts hemp tow. To mix the above, use Clothing. Balard recommends the applicaheated cylinders, so as to obtain a very tion of acetate of alumina for the purpose of homogeneous paste, which is made into thin rendering clothing impervious to water. The cakes, and afterward divide into small pieces cloth is to be immersed in a mixture of soluis to be immersed in a mixture of solutions of acetate of lead and sulphate of alumina; by mutual decomposition of the salts, acetate of alumina is produced on the cloth, and when the goods are dried, basic acetate of alumina adheres to the fibre, and thus protects it from the action of moisture. The process is particularly recommended for military goods. to be dissolved. To dissolve this substance, take 44 pounds spirits of turpentine, benzine, (common is preferable), petroleum, or sulphuret of carbon, to 25 pounds of the mixture. It must be stirred 5 or 6 times during 24 hours, at the end of which time the mass will be thoroughly dissolved. The solution is then spread on the fabrics or articles to be preservcd, by means of rollers, knives, or spatulas, adapted to the purpose. Apply as many coats as may be necessary, and then let it dry.

As soon as the fabric is dry, it is passed under pasteboard laminating rollers, in order to give a lustre to the surface. The fabric is then rolled up on a hollow iron pipe, which is covered with cloth to prevent it sticking to the iron, and the whole placed in a copper pipe, with a perforated lid or cover; steam is then introduced at a pressure of 4 atmospheres, which pressure is maintained for 1 hour, at the end of which time the operation ina alone. (See No. 1561.) is ended. If it be desired to give these im- 1561. To Waterproof Linen, Canvas, permeable covers a black color, a solution of &c. Three baths are prepared as follows: sulphate of iron, nut-gall and logwood is ap- The first, by dissolving 1 part neutral sulby dissolving 1 part neutral sulplied with a brush. 1557. To Make Waterproof Joint Closers. Caps or joint closers can be made of