The great object of his labors and experiments was to find some means hy which articles now made by the slow process of forging could be made from cast iron. These eflbrts have been crowned with complete success, and bid fair to work a complete revolution in the manufacture of iron implements. In 1853 Johnson, Cox & Fuller came to Spuyteu Duyvil and purchased a tract of one hundred and eighty acres of land, on the north side of Spuyten Duyvil Creek and adjoining Hudson River. Here they established a foundry and stove factory and carried on the business. Mr. Johnson, having once fairly started on his new process, pursued it with his wonted vigor. In 1861 General Delafield, of the United States army, designed the gun which bears his name. The first cannon, which were made at the famous Parrott Foundry, at Cold Spring, failed to stand the test, and burst after a few discharges. Without any knowledge of this fact, Mr. Johnson made a proposition to furnish four guus of his pattern and warrant them to stand firing one thousand rounds each without bursting. The offer being accepted, the guns were furnished, and not one failed. This not only established the fame of the inventor, but of the manufacturer as well, and sixty-four additional guns were made, which did good service iu the field. Soon after Mr. Johnson entered into an agreement with the Parrott Company, and made shot and shell for them during the war. To explain the process by which the various articles are produced at the Johnson Foundry, and to enumerate them, would very far exceed our limits. It is sufficient to say that they are the results of a thorough knowledge of chemical analysis, a careful selection of materials and a skillful mode of preparation.