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The tape will pulled less than its standard length when a tension less than the standard tension is applied, making the tape too long. A tape stretches in an elastic manner until it reaches its elastic limit, when it will deform permanently and ruin the tape. The correction due to tension is given by:
Correction tape is sold in short spools for hand use, or as long rolls to be used in typewriters, which apply sudden pressure when a key is struck, and can therefore apply the masking material in exactly the same shape and position as the erroneous character. Some versions of correction tape are sold in separate dispensers that are used to roll ...
Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...
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Such misalignment would be intolerable in a calculator's dials, so each of the Marchant's dials had a constant-lead ("snail") cam attached. Omitting important details, this cam determined the amount of movement needed to realign the result dials. That correction was applied by a second spur-gear differential, again, one per dial.
The HP-41C series are programmable, expandable, continuous memory handheld RPN calculators made by Hewlett-Packard from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities.
The pocket-sized Hewlett-Packard HP-35 scientific calculator was the first handheld device of its type, but it cost US$395 in 1972. This was justifiable for some engineering professionals, but too expensive for most students. Around 1974, lower-cost handheld electronic scientific calculators started to make slide rules largely obsolete.
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