-
A sundial is an instrument showing the time by the shadow of a pointer cast by the sun onto a plate marked with the hours of the day.
-
a ruler with a sliding central strip, marked with logarithmic scales and used for making rapid calculations, especially multiplication and division.
-
English mathematician, inventor, and pioneer of machine computing. With Ada Lovelace, he designed a mechanical computer that would perform calculations and print the results, but he was unable to complete it during his lifetime. -
English mathematician; full name Augusta Ada King Lovelace. The daughter of Lord Byron, she worked with Charles Babbage on his “analytical engine,” a mechanical computer. The Ada standardized computer language was named for her in 1980.
-
A relay is an electrically operated switch. It consists of a set of input terminals for single or multiple control signals and a set of operating contact terminals.
-
She taught mathematics at Vassar College 1931–44 before serving in the US Navy 1943–86, where she became the highest ranked female officer. From 1959 until 1971, she worked as a computer programmer for the Sperry Rand Corporation.
-
International Business Machines, a leading US computer manufacturer. -
He developed the concept of a theoretical computing machine and carried out important code-breaking work during World War II. He also investigated artificial intelligence.
-
a card perforated according to a code, for controlling the operation of a machine, used in voting machines and formerly in programming and entering data into computers.
-
The Harvard Mark 1 was an early electromechanical computer. It used punched tape and a series of switches and drive shafts to automatically perform calculations
-
The Harvard Mark II, also known as the Aiken Relay Calculator, was an electromechanical computer built under the direction of Howard Aiken at Harvard University, completed in 1947 -
a semiconductor device with three connections, capable of amplification in addition to rectification.
-
US computer entrepreneur. He co-founded the Apple computer company in 1976 with Steve Jobs and helped to lead it until 1981 and again from 1983 until 1985.
-
the principle that the speed and capability of computers can be expected to double every two years, as a result of increases in the number of transistors a microchip can contain
-
a visual way of interacting with a computer using items such as windows, icons, and menus, used by most modern operating systems. -
a small computer that contains a microprocessor as its central processor.
-
a computer designed for use by one person at a time.
-
The Apple-1 computer consisted of a single motherboard, with about 60 chips, fully pre-assembled. At the time, computers did not come assembled and consisted of multiple circuit boards.
-
The first electronic spreadsheet. Introduced in 1978 for the Apple II, VisiCalc was conceived by Harvard student Dan Bricklin and programmed by his friend Bob Frankston. -
a computer operating system with a graphical user interface.