Stibitz's Complex Number Computer it's finished in 6 months. || Contentsġ939/04 In 1939/04, at Bell Labs, NY, USA, work begins on George R. The late 1930s In the late 1930s, in France (at the Institut Blaise Pascal?), Louis Couffignal writes several papers on the design of an electromechanical calculator using binary arithmetic. Stibitz, having assembled on his kitchen table a "breadboard" circuit of electromechanical telephonic relays called a flip-flop, plans a non-programmable Complex Number Computer. Cf the halting problem (das Entscheidungsproblem).ġ937 In the autumn of 1937, at Bell Labs, NY, USA, George R. 230-265, in which he posits the possibility of constructing a not-then-existent general-purpose computer, now called a Turing machine and describes its characteristics, including what it can and can not do. || Contentsġ936 British mathematician Alan M Turing has a seminal paper published entitled "On Comparable Numbers, with an Application to the Entscheidungsproblem", published in the Proceedings of the London Mathematical Society, Vol. ![]() || Contentsġ930 In 1930, at MIT, Vannevar Bush makes an analog Differential Analyzer to solve differential equations. Watson Sr, re-names the company International Business Machines Corporation ( IBM) || Contentsġ927 In 1927, in the USA, Philo Taylor Farnsworth, 1906-1971, demonstrates a working model of a televison system. || Contentsġ924 In 1924, in the USA, CTR's president, Thomas J. || Contentsġ896 In 1896, in the USA, Herman Hollerith forms the Tabulating Machine Company, which he later sells to businessman Charles Ranlegh Flint, who merges it with companies that make shopkeeper's scales and workplace time-clocks to create a conglomerate that he calls the Computing-Tabulating-Recording Company ( CTR). Bureau of the Census which had needed seven years to process the data from the census of 1880. || Contentsġ890 In 1890, at MIT, Herman Hollerith, inspired by passenger-train conductors' punch-photographs that identified ticket-holders by certain variables such as size of nose and color of hair and of eyes, builds a punched-card tabulator for the U.S. || Contentsġ833 In 1833, in England, mathematician Augusta Ada King, countess of Lovelace, designs, and her lover Charles Babbage begins but discontinues building, an Analytical Engine to store information, and perform calculations of any kind, using Jacquard's punched-card input of both a program and variable data. ![]() || Contentsġ825? In 1825?, in France, Joseph-Marie Jacquard invents a loom controlled by punched cards. || Contentsġ823 In 1823, in England, mathematician Augusta Ada King, countess of Lovelace, designs, and her lover Charles Babbage begins but discontinues building, a Difference Engine to generate tables. || Contentsġ673 In 1673, in London, Gottfried Wilhelm Leibniz, born in Leipzig in 1646, exhibits his Stepped Reckoner that can add, subtract, multiply, & divide but, because of economics, his machines are not used widely until 1820ish. ![]() || Contentsġ642 In 1642, in France, Blaise Pascal makes an adding machine, the Pascaline, for his tax-collector father. Lotus 1-2-3, from Lotus Development Corporation, is the killer app spreadsheet program for its sole platform, the IBM Personal Computer, on which it runs like lightning, in native code, in 1981.ġ6 16, which = 2^4 = 256, is the number-base for hexadecimal arithmetic. | Other pages | Other sites | End of Pageġ-2-3 1-2-3, a.k.a. Table of Contents Title | Table of Contents | Please click here to verify completion of transmission of this document Specially designed fibers are also used for a variety of other applications, some of them being fiber optic sensors and fiber lasers.© 1998, 1999, 2000 by Arden Schaeffer, 1932-2032?, author & webister Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than wire cables.įibers are used instead of metal wires because signals travel along them with lesser amounts of loss in addition, fibers are also immune to electromagnetic interference, a problem from which metal wires suffer excessively.įibers are also used for illumination, and are wrapped in bundles so that they may be used to carry images, thus allowing viewing in confined spaces, as in the case of a fiberscope. An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |