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On January 4, 1972, Hewlett-Packard announced the HP-35, world's first scientific calculator small enough to fit in a pocket - more precisely, Bill Hewlett's shirt-pocket. The HP-35 was an immediate hit with students, engineers, and scientists. Despite its steep price of $395 (about $3000 today), it sold ten times better than anticipated in the first year. Experience this unique calculator that won HP the prestigious "IEEE Milestone in Electrical Engineering and Computing" in 2009. Features: • Photo-realistic look-and-feel • Th...

"We went to the moon with slide rules" Norman Chaffee (NASA engineer) Then the HP-35 calculator came in 1971, and slide rule has disappeared. Almost 40 years after we will go to the moon soon again. So take the slide rule with you. Just in case ... on IPhone. This application for Slide Rule has 12 scale configuration, and allows multiplication, division, sines, tangents, roots, squares, logarithms and more. Help on "how to use" is also available. Simple to understand and fun to use. Easily scroll the top and the bottom rule, mi...

Pocket calculators, especially the HP-35 scientific calculator (1972), have caused the extinction of the analog computing tools (slide rules). Recent studies on parallel computing are bringing back the analog instruments. For example: we want to buy the products in Europe with American currency. On a slide rule we set the exchange rate of Euro / US Dollar. We can calculate the price of the first product at the fixed rate (simple operation for any digital calculator and for any analog calculator). and in real time, we can calculate ...

A calculator using rpn (reverse polish notation) Wikipedia: [https://en.wikipedia.org/wiki/Reverse_Polish_notation] Reverse Polish notation (RPN) is a mathematical notation in which every operator follows all of its operands, in contrast to Polish notation (PN), which puts the operator in the prefix position. It is also known as postfix notation and is parenthesis-free as long as operator arities are fixed. The description "Polish" refers to the nationality of logician Jan Łukasiewicz,[1] who invented (prefix) Polish notation in...

RPN-45 SD is a complete simulation of the scientific hand-held calculator HP-45 from 1973. Powerful enhancements turn the calculator into an amazingly useful tool for the 21st century. Features: • Photo-realistic look based on an existing device • Original LED display or high-contrast LCD display • Printer to keep a record of calculations • Animated keys with adjustable click sound and visual feedback • Simulation of the HP-45's computation times (may be disabled) • All functions and operations of the HP-45 fully implemented • "S...