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Virtual slide rule
Before electronic hand held calculators, the slide rule was widely used in Engine- ering, Science and Commerce for rapidly performing calculations involving multipli- cation and division which have to be accurate to not more than three or four decimal places. This model is really basic and very easy to use.
Due to the size of the slide rule the page is intentionally out of the frame.
Example: 2.3 x 3.4 (uses C and D scales)
Example: 4.5 / 7.8 (uses C and D scales)
Example: 2.5 2 (uses A and D or B and C scales)
Now we can try this operation: √350 / 1,51
Not bad in a couple of seconds, an electronic calculator would have been just a little more precise, finding 12.3896. This slight approximation has not prevented von Braun to send the Man on the Moon: the slide rule is in fact less difficult than it sounds, the secret is just to practice, to practice and to practice ...
Nicola Marras 2008