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The name 35 derives from the number of keys but in the first series was not reported, needless to characterize a product in the absence of competitors! Its operation is special: it uses the logical principle of Reverse Polish Notation (RPN), designed in the '20s by Jan Lukasiewicz, which allows to describe any formula without the use of parentheses. Before you enter the operands and then operators: (4 + 5) x 6 becomes 4 ENTER 5 + 6 = x and therefore lacks the key =. The RPN eliminate the problems due to parentheses and operator precedence (first division, then the addition etc..). To make a simple example try to find the hypotenuse of a right triangle with legs of 3 and 4 cm, actually easier than with a slide rule: first the calculator must be switched on clicking on the switch located in the upper left, then you can use as normal but when you ahave finished do not forget to turn off the power: the batteries last for a very short time.
The current HP 35s: its operation is similar to the model of 1972
No name for the first calculators: were only "electronic slide rules"
Nicola Marras 2008
Credits: Neil Fraser
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