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Webster 1913 Edition
Siderography
Sidˊer-og′ra-phy
,Noun.
[Gr. [GREEK][GREEK][GREEK] 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 The process has been superseded by electrotypy.
Webster 1828 Edition
Siderography
SIDEROG'RAPHY
,Noun.