Category:Siderography

Sid`er*og"ra*phy, n. Etym: [gr. -graphy.]

Defn: 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 The Process has been superseded by electrotypy.