siderography

1 definition found

siderography - Collaborative International Dictionary of English v.0.48 :

  Siderography \Sid`er*og"ra*phy\, n. [Gr. ??? iron + -graphy.]
     The art or practice of steel engraving; especially, the
     process, invented by Perkins, of multiplying facsimiles of an
     engraved steel plate by first rolling over it, when hardened,
     a soft steel cylinder, and then rolling the cylinder, when
     hardened, over a soft steel plate, which thus becomes a
     facsimile of the original. The process has been superseded by
     electrotypy.
     [1913 Webster]