different between siderographer vs siderography

English

siderographer (plural siderographers)

sidero- +? -graphy

siderography (uncountable)

A 19th-century process of reproducing steel-engraved designs for printing. The design is engraved on a steel block, then hardened and used to transfer a raised-image version to a steel roller under heavy pressure. The roller is then hardened and used as a die to impress duplicate images on printing plates for transferring to paper by the intaglio method.

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