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The process was called mimeography, and a copy made by the process was a mimeograph. Mimeographs, along with spirit duplicators and hectographs , were common technologies for printing small quantities of a document, as in office work, classroom materials, and church bulletins.
Using letter copying presses, copies could be made up to twenty-four hours after a letter was written, though copies made within a few hours were best. A copying clerk would begin by counting the number of master letters to be written during the next few hours and by preparing the copying book. Suppose the clerk wanted to copy 20 one-page letters.
Relief printing including woodcut; Intaglio (printmaking) or copperplate engraving; Planographic printing; Line engraving; 1917 office with a "Multigraph" duplicating machine at lower right. Printing/Applied ink methods Letterpress printing (via printing press) Gelatin methods (also indirect method) Hectograph; Collography, autocopyist
William Bullock (1813 – April 12, 1867) was an American inventor whose 1863 improvements to Richard March Hoe's rotary printing press helped revolutionize the printing industry due to its great speed and efficiency. A few years after his invention, Bullock was accidentally killed by his own web rotary press.
The general form of letterpress printing with a platen press shows the relationship between the forme (the type), the pressure, the ink, and the paper. Letterpress printing is a technique of relief printing for producing many copies by repeated direct impression of an inked, raised surface against individual sheets of paper or a continuous roll ...
A spirit duplicator (also Rexograph and Ditto machine in North America, Banda machine and Fordigraph machine in the U.K. and Australia) is a printing method invented in 1923 by Wilhelm Ritzerfeld, which was used for most of the 20th century. The term "spirit duplicator" refers to the alcohols that were the principal solvents used in generating ...
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