The Boot and Shoe Manufacturers' Assistant and Guide. / Containing a Brief History of the Trade. History of India-rubber and Gutta-percha, and Their Application to the Manufacture of Boots and Shoes. Full Instructions in the Art, With Diagrams and Scales, Etc., Etc. Vulcanization and Sulphurization, English and American Patents. With an Elaborate Treatise on Tanning.

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WATER-PROOF CEMENT.

Take of the best glue four ounces, of isinglass two ounces, and dissolve them in mild ale over a slow fire, in a common glue kettle, to the consistence of strong glue, when one ounce and a half of well boiled linseed oil must be gradually added, and the whole be well mixed by stirring. When cold and made into cakes, it resembles India-rubber. When wanted for use dissolve a piece of it in a proportionate quantity of ale. This cement is applicable to all joints of wood, to join earthen-ware, china, glass. It is an excellent cement for leather, for harness, bands for machinery, &c. The joints of these are to be prepared as if for sewing, the cement to be applied hot, laying a weight upon each joint as it is made, in which state it is to be left six hours, when the joints will be found nearly as firm as if they were of an entire piece. By adding a little tow to the above, you have an excellent cement for leaks in casks, &c.