IBM Selectric | Wikipedia audio article
Channel: wikipedia tts
Date: 29/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/IBM_Selectric_typewriter


00:01:53 1 History, models, and related machines
00:02:05 1.1 Original Selectric
00:02:56 1.2 Selectric II
00:04:33 1.3 Correcting Selectric II
00:06:28 1.4 Selectric-based machines with data storage
00:09:25 1.5 Selectric Composer
00:16:05 1.6 Selectric III
00:20:16 1.7 Replacement
00:20:43 1.8 Eavesdropping
00:21:43 2 Keyboard layout
00:24:04 3 Selectric mechanism
00:33:09 4 Ribbons
00:37:59 5 Type elements and fonts
00:42:18 5.1 Small (12-pitch) fonts
00:45:04 5.2 Large (10-pitch) fonts
00:54:46 6 Features and uses



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SUMMARY
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The IBM Selectric typewriter was a highly successful model line of electric typewriters introduced by IBM on 31 July 1961.Instead of the "basket" of individual typebars that swung up to strike the ribbon and page in a typical typewriter of the period, the Selectric had a "typing element" (frequently called a "typeball", or more informally, a "golf ball") that rotated and pivoted to the correct position before striking. The element could be easily changed so as to use different fonts in the same document typed on the same typewriter, resurrecting a capability that had been pioneered by typewriters such as the Hammond and Blickensderfer in the late 19th century. The Selectric also replaced the traditional typewriter's horizontally moving carriage with a roller (platen) that turned to advance the paper but did not move horizontally, while the typeball and ribbon mechanism moved from side to side.
The Selectric mechanism was notable for using internal mechanical binary coding and two mechanical digital-to-analog converters, called whiffletree linkages, to select the character to be typed.
Selectrics and their descendants eventually captured 75 percent of the United States market for electric typewriters used in business. IBM replaced the Selectric line with the IBM Wheelwriter in 1984 and transferred its typewriter business to the newly formed Lexmark in 1991.  By its 25th anniversary, in 1986, a total of more than 13 million machines were made and sold.