Computes transcendental functions 10 times faster than a slide rule. For greater speed and versatility, the following specific functions are preprogrammed into the HP 35: Arithmetic: Add, subtract, multiply, divide and square root. Trigonometric: Sine, arc sine, cosine, arc cosine, tangent and arc tangent. Logarithmic: Common logarithm, natural logarithm, natural antilogarithm. Other functions: xy, 1/x,, data storage and positioning keys. Easy-to-read LED display gives answers with accuracy of up to 10 significant digits.

Found on the October 1972 issue of Scientific American. The HP 35 was HP’s very first handheld calculator. The HP35A was introduced in 1st February 1972. It is the first handheld calculator ever to perform logarithmic and trigonometric functions with one keystroke. Caption: Hewlett-Packard presents the world’s first pocket calculator that challenges a computer. Slide-rule portability and computer-like power for just $395. The HP35 - A small tribute to great American ingenuity.

Dr. Dennis R. Clark of the Stanford University Medical Center (Northern California), Drug Assay Lab, at work with his HP-35 Calculator. The HP 35, introduced in 1972, was the world’s first handheld scientific calculator. In one of the most amazing displacements in the history of technology, the HP 35 electronic calculator quickly replaced the faithful ‘slip-stick’ - the slide rule - used by generations of engineers and scientists for rapid calculation and simple computation.

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HP Calculators Timeline Before HP Calculator: Mechanical to early electronic calculators Ancient times - The abacus is the main aid to calculation. HPCalc - HP Calculator Model Name : Year Released hp30b - HP Calculator Financial : 2009 hp20b - HP Calculator Financial : 2008 hp35s - HP Calculator Scientific : 2007 hp10s - HP Calculator Scientific : 2007 hp50g - HP Calculator Graphing Calculator : 2006 hp39gs - HP Calculator Graphing Calculator : 2006

Bowmar was a small company specialising in high technology components for the space programmes and produced a hand-held calculator as a demonstration device for its Light Emitting Diode (LED) displays - “funny red numbers that are almost illegible”. So good was the reception to the Bowmar 901B calculator, fondly called the Bowmar Brain, that in September 1971 it moved into large scale calculator production. This model (the 901B) was also produced for other companies including Craig (model 4501) and Commodore (C110).

Curt Herzstark (1902~1988) The Curta looks like a small metal pepper-mill or coffee grinder. It is, in fact, a precision instrument which performs calculations mechanically using no electric or electronic parts. I can best describe the sensation of turning the crank on a Curta as being similar to winding a fine 35mm camera. To the best of my knowledge it is the smallest mechanical calculating machine ever built. The Curta was invented by Curt Herzstark of Austria.

Dalton Adding Machine - Patented 1899-1912 ~ Introduced 1902 James LewisDalton, president of the Addograph Company, formed the Adding Typewriter Company that same year. It was later called the Dalton Adding Machine Company. The Dalton was the first ten key adding machine. It went on to become one of the most popular 10 key adders of the time. Earlier models had glass inserts to allow customers to view the gears actually calculating the answers.