定義

• Contamin.  A die-engraving pantograph developed in 1836 that was the first to employ a rotating cutter in effect making the pantographic reducer a mechanically controlled milling machine instead of a copying lathe. The inventor, Contamin (no other name or dates known) was French; he had adapted an earlier French mechanical pantograph by Jean Baptiste Dupeyrat, ca 1788, improving greatly upon this machine and
  was the forerunner of the highly successful reducing machine of Victor Janvier, patented in 1899. Contamin's engraving pantograph was in widespread use for over 60 years sometimes in competition with the English mechanical engraver developed by C.J. Hill.  See pantograph.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

人际关系