Cursor (slide rules)

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A slide-rule cursor (the thin red line on the clear piece)
A slide-rule cursor (the thin red line on the clear piece)
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Slide rules use as a cursor a sliding glass or plastic plate etched or painted with a fine line for aligning to the different scales. Slide rule operation consists of finding a number on one scale and lining it up with a number on another scale. If any distance separates the scales, the cursor can serve to line them up accurately or to read off values.

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