siderography

英文释义

n. 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process has been superseded by electrotypy.