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- A slide rule scale is a line with graduated markings inscribed along the length of a slide rule used for mathematical calculations. The earliest such device had a single logarithmic scale for performing multiplication and division but soon an improved technique was developed which involved two such scales sliding alongside each other – hence the name slide rule (colloquially called a slipstick in the United States). Later, multiple scales were provided with the most basic being logarithmic but with others graduated according to the mathematical function required. Few slide rules have been designed for addition and subtraction, rather the main scales are used for multiplication and division and the other scales are for mathematical calculations involving trigonometric, exponential and, generally, transcendental functions. Before they were superseded by electronic calculators in the 1970s slide rules were an important type of portable calculating instrument. (en)
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- Back of slide rule with multiple scales (en)
- Front of slide rule with multiple scales (en)
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- Front and back of Aristo 0972 HyperLog duplex rule (en)
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- Aristo 0972 HyperLog back.jpg (en)
- Aristo 0972 HyperLog front.jpg (en)
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- A slide rule scale is a line with graduated markings inscribed along the length of a slide rule used for mathematical calculations. The earliest such device had a single logarithmic scale for performing multiplication and division but soon an improved technique was developed which involved two such scales sliding alongside each other – hence the name slide rule (colloquially called a slipstick in the United States). Later, multiple scales were provided with the most basic being logarithmic but with others graduated according to the mathematical function required. (en)
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