. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. MECHANICAL COMPOSITION IN PRINTING TURPAIN. 125 several lines are made by cutting the defective part out of the ribbon and substituting a piece of corrected ribbon. Corrections of one or two letters are made in the line by the ordinary nippers after it is cast. Keyboard.—In the latest model of the electrotypograph (1907) the keyboard has in all 97 keys, 90 of which, by means of a shift key, allow the writing of 180 characters. One key is re
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. MECHANICAL COMPOSITION IN PRINTING TURPAIN. 125 several lines are made by cutting the defective part out of the ribbon and substituting a piece of corrected ribbon. Corrections of one or two letters are made in the line by the ordinary nippers after it is cast. Keyboard.—In the latest model of the electrotypograph (1907) the keyboard has in all 97 keys, 90 of which, by means of a shift key, allow the writing of 180 characters. One key is reserved for justifica- tion; its manipulation is entirely mechanical, the operator having only to press it at the end of each line without any preliminary read- ing. One key is added for the feeding holes, 0, in the ribbon; another large key for variable spaces and finally four keys for the fixed spaces, 1 em, 2 em, etc. (2) Casting machine.—The perforated ribbon or band, taken from the composing machine, is transferred to the casting machine (fig. 11). These two machines are entirely independent. The perforated bands can be composed at leisure and the type cast as needed. This is not one of the least advantages of machines casting movable char- acters, and as the electrotypograph is a perfect example of this class of machines, its superiority is particularlj'^ marked. It permits the printing of a limited number of copies of a work, and since the perforated bands are preserved, a new edition may be printed by again casting the tj^pe. Thus as many successive editions as desired may be produced without new composition, or the storage fig. u mhiIx disk of a considerable stock of type or stereotype plates. °*^^J*^ eiectrotypo- Thus, by a process more economical than "stereo- typing, one of the desires of the bookseller is realized. One large printing office in Saxony before the Kevolution, and before the inven- tion of stereotyping, was able to furnish books at prices much
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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
