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Science. Mathematics.        

calculator Instruments and Machines.
 
Difference EngineThe Difference Engine was conceived to calculate and automatically print error-free mathematical tables. It is so named because of the mathematical principle upon which it is based, the method of finite differences.
Napier's BonesNapier's Bones were created by the inventor of logarithms to aid multiplication and division of long numbers.
Slide RuleA Slide Rule is a device used for rapid numberical calculations that involve mainly multiplication and division.
 

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Science.--Mathematics.

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