the slide rule
TRANSCRIPT
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So what is a slide rule?• The slide rule is a mechanical analog computer. • It is used primarily for multiplication and division, and also for functions
such as roots, logarithms and trigonometry, but is not normally used for addition or subtraction.
• Invented around 1620-1630 Edmund Gunter• Modern slide rule 1859 by French artillery lieutenant Amédée Mannheim
Source: https://en.wikipedia.org/wiki/Slide_rule
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This rule
• Bought by my dad in 1973• Hemmi P261• Made by Hemmi Bamboo Slide Rule Company Ltd
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Features
• Exponents• Pi • Trigonometry• Powers• Log
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How to use for multiplication and division?
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Decline of slide rules (1970s)• Lower costs of electronic calculators
• HP-35 (1972):• 1972: US$395• 2016: US$2274• 2016: SG$3090
• TI-30 (1976):• 1976: US$25• 2016: US$106• 2016: SG$144