The author explains that the slide rule's main benefit is that the accuracy of its results is dependent on the length and manufacture of its scales and the material used, which is usually boxwood. The accuracy of ordinary slide rules made from inferior materials, such as boxwood, is limited to three places, which may often be in doubt due to the unequal shrinkage of the material.
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Half Hour Instruction Booklet. at school or college.
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Don’t know who made it
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Universal Slide Rule Vintage 'Unique' Design Made In England
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Slide rule in super condition with case and instructions in Danish.
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