Comrie leslie john (5 Ergebnisse)
- Hardcover
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Zustand: Good. Former library copy. Pages intact with minimal writing/highlighting. The binding may be loose and creased. Dust jackets/supplements are not included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.
- Hardcover
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Anbieter: MW Books, New York, NY, USAMW Books
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First Edition. Near fine copy in the original gilt-blocked cloth boards, showing faint shelfwear only. Remains well-preserved overall; tight, bright, clean and especially sharp-cornered. Physical description; xxvi, 389 pages ; 23 cm. Subjects; Mathematics Tables. Reference. 20th century. Tables. 1 Kg.
Weitere BilderSprache: Englisch
Verlag: The Institute of Physics and the National Laboratory, London, 1944
- Softcover
- Erstausgabe
Anbieter: Boris Jardine Rare Books, Edinburgh, Vereinigtes KönigreichBoris Jardine Rare Books
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In den WarenkorbSoft cover. Zustand: Very Good. 1st Edition. Two single journal issues in printed wraps; 274 x 198mm; pp 129-148, article at 129-135 (August), and 205-220, letter at pp. 218-219. SCIENTIFIC COMPUTING PERFECTED One of the most substantial treatments of the use of everyday office machinery in 'scientific computing', only matched i…n detail in Comrie's own writings, in particular his 1946 article for Mathematical Tables and Other Aids to Computation. Comrie begins with the Differential Analyzer - perhaps the most obvious competitor for his own practice of adapting office machinery to scientific ends. A very revealing section of the paper deals with 'The Training of Computers', i.e. the ways in which human 'computers' will have to adapt to the new machine methods: "[Computing] is often given to or falls to the lot of people who by their very temperament do not take kindly to it if it gets beyond the slide rule stage, or takes more than five minutes. Among these people I include mathematicians, engineers, draughtsmen and, I am sorry to say, even some physicists." From here Comrie moves on to pen-and-paper integration, the method of finite differences, double-entry interpolation, the use of punched card machines - here referring to his famous calculation of the Moon's motion down to the year 2000 - as well as the solution of simultaneous equations and finally the construction of mathematical tables. One interested reader of the article was R.R.M. Mallock, of the Cambridge Mathematical Laboratory, whose machine for simultaneous equations was rather rudely dismissed by Comrie. The December 1944 issue contains Mallock's response to Comrie, followed by an apology by Comrie, in which he states clearly his preference for mass-produced over one-off machines - a theme that to recur throughout subsequent decades. Very good condition: stamped ('stack') to front cover but otherwise unmarked; stitched as issued; light cover marking and edge-wear; paper flaw to pp. 133-134 of the August issue, affecting 5 or 6 words. References: not in OOC, but see nos 253ff.
- Softcover
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In den WarenkorbComrie, Leslie John (1893-1950). Mathematical tables. Offprint from Monthly Notices of the Royal Astronomical Society 92 (February 1932). [2], [339]-347 [1]pp. 255 x 173 mm. Original gray printed wrappers, a bit sunned. First Edition. "The new tables reflect the modern tendency towards the use of calculating machines in three wa…ys-first, by the extensive use of machines in their making, as reported in prefaces; secondly, by the fact that logarithmic values are tending to be superseded by natural; and thirdly, because the possession of a machine is virtually assumed in tables of special functions, where a wide interval is used and several even orders of differences provided" (p. 339). Origins of Cyberspace 264.
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Anbieter: Jeremy Norman's historyofscience, Novato, CA, USAJeremy Norman's historyofscience
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In den WarenkorbComrie, Leslie John (1893-1950). The application of the Hollerith tabulating machine to Brown's tables of the moon. Offprint from Monthly Notices of the Royal Astronomical Society 92 (May 1932). [1], [694]-707, [1]pp. 3 plates, text illustrations. 257 x 173 mm. Original gray printed wrappers, slightly worn. Very good. First Sepa…rate Edition. Comrie pioneered the use of commercial accounting machines in scientific applications, especially in the production of mathematical tables. The above offprint describes the first use of a punched-card tabulating system in a purely scientific application-calculating the position of the moon at noon and midnight from 1935 to the end of the twentieth century (punched-card tabulators, invented by Herman Hollerith in the 1880s, reigned as the primary means of large-scale data processing prior to the advent of the electronic digital computer). Punching the half-million cards needed for this enormous calculating project took six months, and the calculations, performed at Britain's Nautical Almanac Office, took an additional seven months to complete. The American astronomer E. W. Brown, whose Tables of the Motion of the Moon (1919) supplied the necessary data, was an observer of the process. "Comrie often recalled the 'ecstacies of rapture' with which Brown watched the addition of his own figures at the rate of 20 or 30 a second. The enthusiasm with which Professor Brown described the process of his return to America probably stimulated W. J. Eckert, the leading American pioneer, in the application of these machines to scientific calculations" (Bowden, Faster than Thought, p. 26). Origins of Cyberspace 266. .
