Calenders Heated Internally by Steam, for Spreading India Rubber into Sheets or upon Cloth, called the "Chaffee Machine."
His success was but temporary, however. He obtained an order from the general Government for one hundred and fifty india-rubber mail-bags, which he succeeded in producing, and as they came out smooth, highly polished, hard, well shaped, and entirely impervious to moisture, he was delighted and summoned his friends to inspect and admire them. All who saw them pronounced them a perfect success, but alas! in a single month they began to soften and ferment, and finally became useless. Poor Goodyear's hopes were dashed to the ground. It was found that the aqua fortis merely "cured" the surface of the material, and that only very thin cloth made in this way was durable. His other goods began to prove worthless and his promising business came to a sudden and disastrous end. All his possessions were seized and sold for debt, and once more he was reduced to poverty. His position was even worse than before, for his family had increased in size and his aged father also had become dependent upon him for support.
Friends, relatives, and even his wife, all demanded that he should abandon his empty dreams and turn his attention to something that would yield a support to his family. Four years of constant failure, added to the unfortunate experience of those who had preceded him, ought to convince him, they said, that he was hoping against hope. Hitherto his conduct, certainly had been absurd, though they admitted that he was to some extent excused for it by his partial success; but to persist in it would be criminal. The inventor was driven to despair, and being a man of tender feelings and ardently devoted to his family, might have yielded to them had he not felt that he was nearer than ever to the discovery of the secret that had eluded him so long.
Just before the failure of his mail-bags had brought ruin upon him, he had taken into his employ a man named Nathaniel Hayward, who had been the foreman of the old Roxbury works, and who was still in charge of them when Goodyear came to Roxbury, and was making a few rubber articles on his own account. He hardened his compound by mixing a little powdered sulphur with the gum, or by sprinkling sulphur over the rubber cloth and drying it in the sun. He declared that the process had been revealed to him in a dream, but could give no further account of it. Goodyear was astonished to find that the sulphur cured the india-rubber as thoroughly as the aqua fortis, the principal objection being that the sulphurous odor of the goods was frightful in hot weather. Hayward's process was really the same as that employed by Goodyear, the "curing" of the india-rubber being due in each case to the agency of the sulphur, the principal difference between them being that Hayward's goods were dried by the sun and Goodyear's with nitric acid. Hayward set so small a value upon his discovery that he readily sold it to his new employer.
Goodyear felt that he had now all but conquered his difficulties. It was plain that sulphur was the great controller of india-rubber, for he had proved that when applied to thin cloth it would render it available for most purposes. The problem that now remained was how to mix sulphur and the gum in a mass, so that every part of the rubber should be subjected to the agency of the sulphur. He experimented for weeks and months with the most intense eagerness, but the mystery completely baffled him. His friends urged him to go to work to do something for his family, but he could not turn back. The goal was almost in sight, and he felt that he would be false to his mission were he to abandon his labors now. To the world he seemed a crack-brained dreamer, and some there were who, seeing the distress of his family, did not hesitate to apply still harsher names to him. Had it been merely wealth that he was working for, doubtless he would have turned back and sought some other means of obtaining it; but he sought more. He felt that he had a mission to fulfil, and that no one else could perform it.
He was right. A still greater success was about to crown his labors, but in a manner far different from his expectations. His experiments had developed nothing; chance was to make the revelation. It was in the spring of 1839, and in the following manner: Standing before a stove in a store at Woburn, Mass., he was explaining to some acquaintances the properties of a piece of sulphur-cured india-rubber which he held in his hand. They listened to him good-naturedly, but with evident incredulity, when suddenly he dropped the rubber on the stove, which was red hot. His old clothes would have melted instantly from contact with such heat; but, to his surprise, this piece underwent no such change. In amazement he examined it, and found that while it had charred or shrivelled like leather, it had not softened at all. The bystanders attached no importance to this phenomenon, but to him it was a revelation. He renewed his experiments with enthusiasm, and in a little while established the facts that india-rubber, when mixed with sulphur and exposed to a certain degree of heat for a specified time, would not melt or soften at any degree of heat; that it would only char at two hundred and eighty degrees, and that it would not stiffen from exposure to any extent of cold. The difficulty now consisted in finding out the exact degree of heat necessary for the perfecting of the rubber and the exact length of time required for the heating.
