The end of a slip of metal is presented between the rollers whilst they are in motion, not on that side of the roller which would operate to draw the slip in between them, as in rolling mills, but on the contrary side, so that when one of the flat sides of the roller B conies opposite the circumference or the roller A, an opening is lormcd, through which the end of the slip of metal is to be intro duced, until it bears against the fixed stop 6. at the back of the rollers; now as the rollers turn round, the cylin drical portions come opposite, and press the metal be tween them, forcing it outwards, rendering the part which has been introduced between the rollers as thin as the space between their cylindrical surfaces, which al lows the end of the slip of metal to be passed between the dies of the drawing machine to be seized by the pinchers.
In using the drawing machine, a boy takes hold of the handle s, (when the hook t is disengaged from the endless chain) and moves them upon their wheels to wards the die-box C. This causes the jaws of the pinch ers to open by the two pins, v, v, which are fixed across between the links q, acting upon inclined parts outside of the pincher tales, as seen in Fig. 3. The pinchers are pushed up so close to the die box, that their jaws enter the cavity w, which brings them near the dies, in order to seize the end of the slip of metal introduced between them. The boy now holds the handle 8 upon the top of
the pinchers fast, and with the other hand draws the handle x, at the end of the link q, backwards. This closes the jaws and gripes the metal. He then presses down the handle x till the hook t seizes the endless chain whilst in motion, and carries the pinchers and slip of metal along with it ; when the whole length of the slip of metal has passed through between the dies, the strain upon the pinchers is suddenly relieved, which causes the weight r to raise the hook t above the chain, and stop their motion. The machine in the mint has two sets of dies, and endless chains, as will appear from Fig. 2.
cents, and half cents. Gold and silver are coined for individual depositors only ; copper, on account of the government, but to be transported in exchange for an equal amount in specie, or paper receivable at the bank of the United States, to all parts of the United States, at the expense and risk of the government.
The amount of coinage, in different years, depends on that of the deposits. In the year 1820, the number of pieces coined was 6,492,509, amounting to B1,864,786.
The machinery is moved by a steam-engine.
The drawing-machine, for equalising the thickness of the slips of metal, is precisely the same as that described in page 614 of this Encyclopedia, called " Berton's New Machine," and has been in use since the year 1793.