Illustrated history of the United States mint : with short historical sketches and illustrations of the branch mints and assay offices, and a complete description of American coinage from the earliest period to the present time : the process of melting, refining, assaying, and coining gold and silver being fully described : with biographical sketches of the mint officers from its foundation to the present time : to which are added a glossary of mint terms and the latest official tables of the operations of the different Mints and Assay Offices, showing the annual products of the gold and silver in the United States and foreign countries, with monetary statistics of the world (1893)
Philadelphia : G.G. Evans · leaf 44
f the punch is obtained by an eccentric wheel. For instance, in an ordinary carriage wheel, the axis is in the centre, and the wheel revolves evenly around it. But if the CUTTING MACHINE. axis is placed, say four inches from the centre, then it would revolve with a kind of hobble. From this… … STRIP FROM WHICH PLANCHETS ARE CUT. ing. Now as the wheel revolves and brings the long side near¬ est the rod , it will push forward the rod, and when the long side of the wheel is away from the rod , it draws the rod with it. The upper shaft, on which are seen the three large wheels, has also…
Mints -- United States · Coinage -- United States
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
