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The IBM Selective Sequence Electronic Calculator (SSEC) was an electromechanical computer built by IBM. Its design was started in late 1944 and it operated from January 1948 to August 1952. Its design was started in late 1944 and it operated from January 1948 to August 1952.
For some mathematical functions, a gold f −1 prefix key would access the inverse of the gold-printed functions, e.g. f −1 followed by 4 would calculate the inverse sine (). Functions included square root, inverse, trigonometric (sine, cosine, tangent and their inverses), exponentiation, logarithms and factorial.
James Harold Stock (born December 24, 1955) is an American economist, professor of economics, and vice provost for climate and sustainability at Harvard University. He is co-author of Introduction to Econometrics , a leading undergraduate textbook, and co-editor of the Brookings Papers on Economic Activity .
The HP-55 was a programmable handheld calculator, a lower-cost alternative to the HP-65. Introduced by Hewlett-Packard in 1975, it featured twenty storage registers and room for 49 keystroke instructions.
The Panic of 1825 was a stock market crash that originated in the Bank of England, arising partly from speculative investments in Latin America, including the fictitious country of Poyais. The crisis was felt most acutely in Britain, where it led to the closure of twelve banks, but also affected markets in Europe, Latin America and the United ...
Harvard Mark IV The Harvard Mark III , also known as ADEC (for A iken D ahlgren E lectronic C alculator) was an early computer that was partially electronic and partially electromechanical. It was built at Harvard University under the supervision of Howard Aiken for use at Naval Surface Warfare Center Dahlgren Division .
Marchant XLA calculator, based on Friden's design. The Marchant Calculating Machine Company was founded in 1911 by Rodney and Alfred Marchant in Oakland, California. The company built mechanical, and then electromechanical calculators which had a reputation for reliability. First models were similar to the Odhner arithmometer.
The Hewlett-Packard 9100A (HP 9100A) is an early programmable calculator [3] (or computer), first appearing in 1968. HP called it a desktop calculator because, as Bill Hewlett said, "If we had called it a computer, it would have been rejected by our customers' computer gurus because it didn't look like an IBM. We therefore decided to call it a ...