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Die Polishing Lines Or Hairlines? Trade Dollar

 
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Pillar of the Community
Canada
522 Posts
 Posted 10/26/2018  3:05 pm  Show Profile   Bookmark this reply Add GMS5 to your friends list Get a Link to this Reply
Found more Draw Bench Information:

In the United States silver, in the manufacture of silver coin, is alloyed with copper; the proportion in 1,000 being 900 parts silver and 100 parts copper; and in gold coin, 1,000 parts, 900 being pure gold, 100 alloy of silver and copper, of which not more than 50 parts is allowed by law to be of silver. In practice a very small fraction of this alloy is silver. By means of powerful but accurately constructed rollers, driven by steam, the ingots (which are bars sharpened at one end like the blade of a chisel, and about one foot long, three fourths of an inch to two and a half inches broad, and half an inch thick) are rolled into thin strips or ribbons of the proper thickness for the coin to be made, through the rollers exhibited in the drawing (fig. 4) just above the clock dial. This process is required to be gone through ten times for gold and eight times for silver. These strips must occasionally be annealed in furnaces, in order to soften them, before they are drawn, which latter operation is done by means of the drawing bench (fig. 5), in which they are drawn like wire through a steel gauge to make them straight and of uniform thickness.

I believe it is the rollers on the draw bench that made the marks on the coin (second Image)



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