Spirit duplicator
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Description
A low-volume duplicating machine invented in 1923 by Wilhelm Ritzerfeld. Spirit duplicators, more commonly known as ditto machines, use a two-ply master copy. The master was typed or written on, then the waxed surface of the second sheet was placed on a drum. The drum was alternately rolled through an ink bed then a blank printing page. Most ditto machines were replaced by xerographic copiers by the early 1980s. See also mimeograph.
Synonyms and Related Terms
ditto machine
Resources and Citations
- Wikipedia: http://en.wikipedia.org/wiki/Spirit_duplicator (accessed Nov. 30, 2004)