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Jan 1, 1500
abacus 3000 BC
The abacus is invented in Babylonia 3000 BC. The abacus was like a ancient calculator. -
Jan 1, 1500
Antikythera Device 80 AD
The Antikythera Device, a bronze mechanical lunar month calculator, is constructed in Greece 80 AD. This was a very impresive demonstration of technology by our early realatives. -
slide rule
William Oughtred invents the slide rule. This first one was circular. The slide rule is one of the most important tools we have. -
calculator
Wilhelm Schickard designs the first known mechanical calculator, the "Calculating Clock" to multiply large numbers. Calculators are fery important. -
12 digit calculators
Phillip-Malthus Hahn builds and sells a small number of calculating machines which are accurate to 12 digits. With 12 digits the calculator is much more accurate. -
multiplying calculator
The third Earl of Stanhope invents a multiplying calculator. Multiplication is very important. -
mass-produced calculator
The first mass-produced calculating machine, Thomas de Colmar's Arithmometer, is marketed and continues in use for many years. With mass-produced calculators everyone can have one. -
printing calculator
Scheutz invents the first printing calculator. Printing calculators are very important, for banking and accounting. -
flowcharts
Herman (CPL Irwin?) Goldstine invents flowcharts. Flow charts are very important. -
mouse
Douglas Engelbart receives a patent on the mouse pointing device for computers. The mouse is one of the most important computer devices.
