Gutta-percha, as a cement, was first introduced to our notice in 1849. A medical gentleman having received a severe cut upon one of his fingers, dissolved a portion of the gutta-percha in chloroform, then with a fine brush, first immersed in the solution, passed several times around the finger in order to produce the required thickness; then, immersing his finger in water for a short time, thus formed a neat and durable covering, air and water proof. Thus protected, it healed quickly without soreness or farther trouble. With this cement and crude gutta-percha, we first applied it to Boots and Shoes, and found it held very firmly the fibres of cloth and leather together. A sample in sheet form, we applied with a warm iron. It held with great tenacity, and with an additional quantity, we applied it with entire success, in the repairing of about five hundred pairs of shoes. These shoes had cloth uppers, without “foxing” around the heels, and were badly cut in taking out the “raw” in finishing the knife work around the heel. We have continued the use of gutta-percha as a cement for shoes, also as a water-proofing substance between the inner sole and the outer sole, and our experiments were fully successful. This process also prevented the boots and shoes from “squeaking,” that horror of nervous temperaments, at the same time adding greatly to the durability of the leather.
OBSERVATIONS CONCERNING GUTTA-PERCHA AND RUBBER IN THEIR USES IN THE MANUFACTURE OF BOOTS AND SHOES.
Among the many advantages we have observed in our experiments in the use of gutta-percha in the manufacture of boots and shoes, are its exceeding fine grain, its perfect water and oil repellent properties, which render it far superior to all rubber cements and combinations ever offered to the public. Gutta-percha is proof against water, acids, and oily substances, dampness and decomposition. It is very tenacious, clean, and sweet, and will stand all weathers, and will not become sticky. The boots or shoes made with it, may be worn in damp or dry localities, through water, oily or acid combinations, without injury to the cement. These statements are corroborated by actual tests of the severest nature.
No one will doubt who will investigate the subject of the application of gutta-percha to boots and shoes. It is worthy the study of all engaged in the manufacture of these articles, and will amply repay the closest study and investigation. Nor can it be doubted that it is destined, in a very brief period, to supersede all other improvements in the manufacture of boots and shoes.
In 1855, the “The North American Patent Boot and Shoe Co.” tested gutta-percha as a cement after they had abandoned a rubber filament or cement as useless. They continued to manufacture boots and shoes by the use of gutta-percha, and found, after a long and satisfactory trial, through all seasons of the year, that it remained firm and uninjured, not being in the least affected by the oleaginous substances or fluids used in preparing the various kinds of upper leather or sole leather. The oily matter here referred to, destroys all the rubber cements, and the Company found that gutta-percha continued as firm and tenacious after their tests, as when first applied to the shoe, and was not affected by other chemical combinations used in the construction of the shoe. That Company spared no pains or expense in perfecting part of the manufacture of the shoes, whereby they were enabled to produce a quality of goods never before equalled in lightness, style, or practical utility, exceeding, as they did, the most sanguine expectations of all interested. They fully demonstrated that shoes thus manufactured were far superior to the sewing or pegging process, or rubber cements; thus proving conclusively that the process is destined to produce an entire revolution in the manufacture of every description of fine shoes and boots.
Gutta-percha cement applied to sole leather renders it water-proof just in proportion as it is mixed with its fibres, and the quantity applied; at the same time improving the leather more than one hundred per cent. as it adds to its solidity and durability. The mixing, mingling, or saturating the fibres of the leather, or other fibrous substances, as cloth, with the cement, gives it its firm and tenacious hold on the various substances to which it is applied in the manufacture of boots and shoes, and all other combinations that require a tenacious cement.
PROCESS FOR MANUFACTURING BOOTS OR SHOES BY SIMPLY CEMENTING THE EDGES OF THE IN SOLE AND OUTER SOLE.
Objections are sometimes urged against the gutta-percha sole as being liable to sweat the feet. This objection we regard as purely mythical, as no such result will follow unless the feet are encased in rubber or gutta-percha. The top of the foot being covered with leather, thus allowing the perspiration to escape, the gutta-percha sole acts only as a protection, thus avoiding the unpleasant effects realized in wearing India-rubber shoes. Shoes or boots may be made, if desired, by cementing the edges of the inner sole and outer sole only. This process obviates the objection just alluded to. We have manufactured shoes in this manner, which have worn at least one-third longer than when pegged or sewed, the materials being the same. For perfectly dry walking they are a very desirable article. Only about one-fourth the quantity of cement is required when manufactured in this manner.
CHAPTER V.
GUTTA-PERCHA FOR BELTS, HARNESSES, &C.
Belts of leather may be put together by this cement, which adds greatly to their wear and durability, not being in the least affected by dampness, neither by the oils which may come in contact with them from the machinery. In cutting up belt for harness leather, there is usually great waste and loss of stock, as portions of the sides are very thin, and unfit for use. But by this process every particle may be saved. Cut the stock the proper width, stretch it, then raise a strong thick fibre on all the thin parts and the laps. Apply the cement hot with a brush to all the thin portions and laps. Let it dry until the solvent has evaporated; then heat the parts sufficiently, and press together with a vice or clamps. On all the thin places apply a piece of the cemented leather until the belt is of an even thickness; press firmly together, then shave off the projections with a knife or cutting machine. Trim the edges: you will thus produce a firm, smooth belt, without a stitch, rivet, or lacing. All portions of a harness or saddle may be cemented in the same manner. This process is exceedingly simple, at the same time economical—a saving of time and money, and adds greatly to their durability.