Mint

Collier's New Encyclopedia (1921)

the place where a country's coinage is made and issued under special regulations and with public authority. In former times the coinage was made by contact at a fixed price. The present mint on Tower Hill, in London, was erected between the years 1810 and 1815. The English mint supplies the whole of the coinage of the British Empire, except Australia and the East Indies. In the United States there are mints at Philadelphia, established in 1792; at San Francisco, established in 1853; and at Denver, established in 1862. In the United States the Bureau of the Mint was established as a division of the Treasury Department in 1873. It has charge of the coinage for the government and makes assays of precious metals for private owners. The rolling machines are four in number. The roll ers are adjustable, and the space between them is governed by the operator. About 200 ingots are run through per hour on each pair of rollers. When the rolling is completed the strip is about six feet long. As it is impossible to roll perfectly true, it is necessary to "draw" anthese strips, after being softened by nealing. The drawing benches resemble long tables, with a bench on either side at one end of which is an iron box se cured to the table. In this are fastened two perpendicular steel cylinders. These are at the same distance apart that the thickness of the strip is required to be. It is drawn between the cylinders, which reduces the whole to an equal thickness. These strips are now taken to the cutting machines, each of which will cut 225 planchets per minute. The press now used consists of a vertical steel punch. From a strip worth $1,100 about $800 of planchets will be cut. These are then removed to the adjusting room, where they are adjusted. After inspection they are weighea on very accu- . If a planchet is too heavy, it is filed off at the rate scales the weight, filing, it is thrown but near too heavy for to be remelted edges; if with the light ones adjusted, are aside . , after being milling rooms The planchets to the coining and , the milling mataken passed through are fed to this and are The The planchets tube, and as chine. through an upright on the edge of machine descend are caught carried about a they wheel and during which a revolving a revolution, and forced up quarter of is compressed half-dimes can be the edge . apparatus 560 large pieces the By this a minute; for massive but delimilled in is 120. The from 80 to 100 average presses coin cate coining inte 97° 969 A B Whitemouth L. DOMINION. 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