Make your own 1952 fraction of an inch adding machine – Artofit

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Make your own 1952 Fraction-of-an-inch Adding Machine
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Make your own 1952 Fraction-of-an-inch Adding Machine

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The Appeal of Slide Rules - For Use and as Collectables.

Calculators!
Make Your Own Wallet-sized Enigma(tm)-like Machine

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Design: Wheels
CIRCULAR CD SLIDE RULE

Science, Math, Engineering & Technology!
Bank of England celebrates 325 years with 325 “curiosities”

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CIRCULAR CD SLIDE RULE

watch clocks
CARDBOARD SLIDE RULE

Mathematics
Make Your Own Wallet-sized Enigma(tm)-like Machine

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Enigma/Paper Enigma

Tricks and experiments