A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . surface. Tlie blanks, after leaving the hot-air bath just described, are taken into the press roomto receive the impression which renders them the coin of the realm. Next to the weighingmachines, invented by Mr. Cotton, the coining press is the most beautiful piece of mechan-ism in the Mint. It is automaton, and does all that is required of it without the aid of man,and it may even be said to talk, for it is the most noisy of all the Mint machinery. Whenthe eigh
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . surface. Tlie blanks, after leaving the hot-air bath just described, are taken into the press roomto receive the impression which renders them the coin of the realm. Next to the weighingmachines, invented by Mr. Cotton, the coining press is the most beautiful piece of mechan-ism in the Mint. It is automaton, and does all that is required of it without the aid of man,and it may even be said to talk, for it is the most noisy of all the Mint machinery. Whenthe eight presses are at work, it is quite hopeless to hear a word spoken. Fif). 462 is arepresentation of one of these presses. It stands on a solid bed of masonry, and is firmly MINT. 771 bolted down. The massive frame-work c is made of cast iron, and is perforated from thetop to admit of the passage of a powerful screw which is represented by d as travelhngthrough the solid mass, d is continued upwards through the ceiling of the room by a rodof iron which is enclosed by a trumpet-shaped case of iron, represented by a. At the top 462. of A is fitted a lever, which drives the press by the agency of the air-pump. The iron rodwhich continues from d through a, passes freely through an eye-hole in the lever of a, andis then provided with a swivel joint, which terminates its horizontal motion, while the rodwhich carries the swivel joint is attached to a long lever, the farther end of which is con-nected with a piston whrking in a partly exhausted cylinder, so that when n is forced downby the action of the air-pump, it of necessity lifts this piston from the bottom of its cylin-der, thereby causing a partial vacuum ; the atmosphere tlien pressing on the piston over-balances the weight of n, and returns it to its position, that its lever may iigaiii come underthe influence of the air-pimip. On tlie bars r are fitted blocks of iron, wood, wood linedwith iron, or iron lined with wood, accordin
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
