The Signal Oil-Works, Franklin, manufacture Sibley’s Perfection Valve-Oil for locomotive-cylinders and Perfection Signal-Oil. More than twenty-five years ago Joseph C. Sibley commenced experimenting with petroleum-oils for use in steam-cylinders under high pressure. He found that where the boiler-pressure was not in excess of sixty pounds the proper lubrication of a steam-cylinder with petroleum was a matter of little or no difficulty. With increase in pressure came increase in temperature. As a result the oil vaporized and passed through the exhaust. The destruction of steam-chests and cylinders through fatty acids incident to tallow, or tallow and lard-oils, cost millions of dollars annually; but it was held as a cardinal point in mechanical engineering that these were the only proper steam-lubricants. Mr. Sibley carried on his experiments for years. He conversed with leading superintendents-of-machinery in the United States and with leading chemists. Almost invariably he was laughed at when asserting his determination to produce a product of petroleum, free from fatty acids, capable of better lubrication even than the tallow then in use. Many of his friends in the oil-business, who thought they understood the nature of petroleum, expressed the deepest sympathy with Mr. Sibley’s hallucination. Amid partial successes, interspersed with many failures, he continued the experiments. So incredulous were chemists and superintendents-of-machinery, so fearful of disasters to their machinery through the use of such a compound, that he had in many instances to guarantee to assume any damages which might occur to a locomotive through its use. He rode thousands of miles upon locomotives, watching the use of the oil, daily doubling the distance made by engineers. Success at last crowned his efforts and the Perfection Valve-Oil has been for nearly twenty years the standard lubricant of valves and cylinders. To-day there is scarcely a locomotive in the United States that does not use some preparation of petroleum and the steam-chests and cylinders of _more than three-fourths_ of all in the United States are lubricated with Perfection Valve-Oil.