Spirit Duplicator ...
"This machine printed from a "master" created in the same manner in which hectographic master sheets for spirit duplicators were made, but considerably before their introduction" (Rhodes and Streeter 109).
Relation to Other Copying Processes -Mimeograph
Notion of Spirit
Curwen, Harold. Processes of Graphic Reproduction in Printing. London: Faber and Faber, 1963.
Doss, Milburn P. (Ed). Information Processing Equipment. New York: Reinhold Publishing Corporation, 1955.
Fisher, Harrison M. Today's Business Machines. Chicago: American Technical Society, 1959
Gardiner, A. W. Typewriting and Office Duplicating Processes. New York: Focal Press, 1968.
Rhodes, Barbara J. and Streeter, William W. Before Photocopying: The Art and History of Mechanical Copying, 1780-1938: A book in two parts. New Castle and Northampton: Oak Knoll Press and Heraldry Bindery, 1999.
Schwartz, Hillel. The Culture of the Copy: Striking Likenesses, Unreasonable Facsimiles. New York: Zone Books, 1996.