IBM Selectric
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The IBM Selectric was a highly successful line of electric typewriters introduced by IBM on 31 July 1961.
IBM Selectric I
A Selectric typing element
IBM Selectric I
IBM Selectric II (with dual Latin/Hebrew element and keyboard). The switch to the right of the backspace key shifts the machine to right-to-left typing, as is required for Hebrew. Note also the two typing position scales, one numbered left to right, the other right to left.
Whippletree (mechanism)
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A whippletree, or whiffletree, is a mechanism to distribute force evenly through linkages. It is also referred to as an equalizer, leader bar, or double tree. It consists of a bar pivoted at or near t
IBM Selectric
…the paper. 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. The three models of Selectric eventually captured 75 percent of the United States market for electric…
A set of whippletrees or leader-bars for the two leaders of a four-horse team
A standard automobile windscreen wiper uses whippletrees in compression to distribute the force of the wiper arm evenly across the blade.
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