Tamil Typewriting Book Pdf
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Some ribbons were inked in black and red stripes, each being half the width and running the entire length of the ribbon. A lever on most machines allowed switching between colors, which was useful for bookkeeping entries where negative amounts were highlighted in red. The red color was also used on some selected characters in running text, for emphasis. When a typewriter had this facility, it could still be fitted with a solid black ribbon; the lever was then used to switch to fresh ribbon when the first stripe ran out of ink. Some typewriters also had a third position which stopped the ribbon being struck at all. This enabled the keys to hit the paper unobstructed, and was used for cutting stencils for stencil duplicators (aka mimeograph machines).[62]
The pace of change was so rapid that it was common for clerical staff to have to learn several new systems, one after the other, in just a few years.[92] While such rapid change is commonplace today, and is taken for granted, this was not always so; in fact, typewriting technology changed very little in its first 80 or 90 years.[93]
Typewriter eraser brushes were necessary for clearing eraser crumbs and paper dust, and using the brush properly was an important element of typewriting skill; if erasure detritus fell into the typewriter, a small buildup could cause the typebars to jam in their narrow supporting grooves.[109]
In non-fiction, the first document examiner[165] to describe how a typewriter might be identified was William E. Hagan who wrote, in 1894, \"All typewriter machines, even when using the same kind of type, become more or less peculiar by use as to the work done by them\".[166] Other early discussions of the topic were provided by A. S. Osborn in his 1908 treatise, Typewriting as Evidence,[167] and again in his 1929 textbook, Questioned Documents.[168] 59ce067264
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