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.

by Unknown

Sixty-first, to Jonathan T. Trotter, New York, January 1, 1851. For improvement in the manufacture of India-rubber.

Having described my improved process of curing rubber, I will state what I claim and desire to secure by letters patent. What I claim, therefore, is the use and employment of zinc, substantially as prepared by the process above described, in combination with India-rubber, for the purpose of curing or vulcanizing it, in form and manner as herein set forth, without the use of free sulphur in any way in combination with the rubber.

Sixty-second, to David McCurdy, Newark, N. J., April 1, 1851. For improvement in the manufacture of India-rubber.

Having described my invention, and the best mode known to me of manufacturing the same, what I claim as my invention, and desire to secure by letters patent, is the combination of potash with rubber and sulphur, and submitting the same to a high degree of heat, whereby to produce the change upon rubber known as vulcanizing.

Sixty-third, to James Reynolds, New York, April 22, 1851. For improvement in machines for gutta-percha tubing and covering wire.

What I claim as my invention, and desire to secure by letters patent, is the use, for the purposes specified, of feed-rollers, C, C, in combination with the stomach, G, G, having a lip, or mouth, h, arranged and operating substantially as shown and described.

Sixty-fourth, to Nelson Goodyear, New York, May 6, 1851. For improvement in the manufacture of India-rubber.

I do not claim the heating or curing process, as it is termed; that having been patented by Charles Goodyear.

What I do claim as my invention, and desire to secure by letters patent, is the combining of India-rubber and sulphur, either with or without shellac, for making a hard and inflexible substance, hitherto unknown, substantially as herein set forth.

And I also claim the combining of India-rubber, sulphur, and magnesia, or lime, or a carbonate, or a sulphate of magnesia, or of lime, either with or without shellac, for making a hard and inflexible substance, hitherto unknown, substantially as herein set forth.