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Topic: Percy Ludgate

	Percy Ludgate - Wikipedia, the free encyclopedia
		Percy Ludgate (August 2, 1883- October 16, 1922) was an accountant in Dublin and designer of an Analytical Engine.
		Ludgate's engine used multiplication as its base mechanism unlike Babbage's which used addition, Ludgate's engine used rods similar to slide rules.
		Ludgate's Analytical Machine of 1909 Brian Randell, The Computer Journal, Volume 14, Issue 3, pp.
	en.wikipedia.org /wiki/Percy_Ludgate (212 words)

	Smart Computing Encyclopedia Entry - Percy E. Ludgate (Site not responding. Last check: 2007-11-03)
		Percy E. Ludgate was an accountant in Dublin, Ireland, who contributed to the advancement of calculators by simplifying and improving on the design of Charles Babbage’s Analytical Engine.
		Ludgate envisioned his machine would function by placing a roll of punched paper, which he called formula paper, over a perforated metal drum that could be rotated.
		Ludgate’s design had his machine using a separate electric motor, and he estimated that two variables of 20 figures each could be added or subtracted in about three seconds and multiplied in about 10 seconds.
	www.smartcomputing.com /editorial/dictionary/detail.asp?guid=&searchtype=1&DicID=18529&RefType=Encyclopedia (281 words)

	Analytical engine - Wikipedia, the free encyclopedia
		Percy Ludgate wrote about the engine in 1915 and even designed his own analytical engine (it was drawn up in detail but never built).
		Ludgate's engine would be much smaller than Babbage's of about 8 cubic feet (230 L) and hypothetically would be capable of multiplying two 20-decimal-digit numbers in about 6 seconds.
		Randell, Brian, From Analytical Engine to Electronic Digital Computer: The Contributions of Ludgate, Torres, and Bush, Annals of the History of Computing, Volume 4, Number 4, October 1982.
	en.wikipedia.org /wiki/Analytical_engine (922 words)

	Ludgate's analytical machine of 1909 -- Randell 14 (3): 317 -- The Computer Journal
		Ludgate's analytical machine of 1909 -- Randell 14 (3): 317 -- The Computer Journal
		Articles by Randell, B. Ludgate's analytical machine of 1909
		Ludgate in Ireland during the years 1903 to 1909, and documents
	comjnl.oxfordjournals.org /cgi/content/abstract/14/3/317 (135 words)

	The Feasibility of Ludgate's Analytical Machine (Site not responding. Last check: 2007-11-03)
		This is a small investigation into how much can be inferred about a machine designed by Percy Ludgate and described in a 1909 paper by him called 'On a Proposed Analytical Machine'.
		See The Computer Journal, Volume 14, Issue 3, pp 317-326 - Ludgate's analytical machine of 1909 which points at the full paper and has an introduction by B.Randell.
		Most of the movements mentioned above, as well as many others, are derived from a set of cams placed on a common shaft parallel to the driving-shaft; and all movements so derived are under the control of the formula-paper.
	www.fano.demon.co.uk /ludgate (4375 words)

	Percy, Bishop Thomas (ed Willmott, illus Corbould) at DustyBookS - search for Percy, Bishop Thomas (ed Willmott, illus ...
		Percy, Bishop Thomas (ed Willmott, illus Corbould) at DustyBookS - search for Percy, Bishop Thomas (ed Willmott, illus Corbould) books, used books, out of print books, rare books, books online, book search, children's books, entertainment book, old books, childrens books, antique books
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		Percy, Bishop Thomas (ed Willmott, illus Corbould) (George Routledge & Sons) Ludgate, London, 1867
	www.dustybooks.co.uk /percy-bishop-thomas-ed-willmott-illus-corbould-.html (286 words)

	Computer (Site not responding. Last check: 2007-11-03)
		Historically many exotic technologies have been explored and abandoned.
		For example, economic models have been constructed using water flowing through multiple-constricted channels, and between 1903 and 1909 Percy E. Ludgate developed a design for a programmable analytical machine based weaving technologies in which variables were carried in shuttles.
		Efforts are currently underway to develop optical computers that use light rather than electricity.
	www.worldslastchance.com /encyclopedia/index.php/Computer (4253 words)

	Bibliography
		Concludes with a mention of the author's own analytical machine (see Ludgate (1909)) and an intriguing mention of a difference engine design he is close to completing.
		No details of either of these machines (other than in his two published papers) are known to survive.
		This paper discusses the little known analytical machine designed by Percy E. Ludgate in Ireland between 1903 and 1909.
	www.meccano.us /bibliography.html (8814 words)

	Sean McGrath's current reading list and recommended reading (Site not responding. Last check: 2007-11-03)
		Even closer to home (Collooney) is the birthplace of William Higgins who invented the chemical notation for Oxygen.
		Down in Cork, an accountant by the name of Percy Ludgate had the designs for a computer in 1909.
		Like the well known Babbage machine, it was never built but it contained some fundamental innovatations such as the concept of a subroutine.
	seanmcgrath.blogspot.com /bookshelf.html#0140289208 (1120 words)

	Antique Books on Egypt Archaeological survey exploration (BOOKS) at ONE OF A KIND ANTIQUES (Site not responding. Last check: 2007-11-03)
		Trubner and Co 57 and 59 Ludgate Hill E. C., Egypt Exploration Fund, "The Store City of Pithom", and "The Route of the Exodus".
		"El Bersheh" Part l "The Tomb Of Tehuti Hetep" by Percy E Newberry London.
		Bindings are fair to good condition with the insides in good to very good condition.
	pages.antiquesandarts.com /5002/PictPage/1922106965.html (203 words)

	From analytical engine to electronic digital computer: The contributions of Ludgate (1883-1922), Torres y Quevedo ...
		From analytical engine to electronic digital computer: The contributions of Ludgate (1883-1922), Torres y Quevedo (1852-1936) and Bush (1890-1974) (Brian Randell)
		Fresco School offers a full spectrum of fresco workshops and classes from introductory level lessons to advanced fresco programs and private fresco tutoring.
		From analytical engine to electronic digital computer: The contributions of Ludgate (1883-1922), Torres y Quevedo (1852-1936) and Bush (1890-1974)
	www.truefresco.org /bookshop/viewproduct.php?country=us&asin=B0007AYYD2 (108 words)

	Directory of Historians of Computing (Site not responding. Last check: 2007-11-03)
		My interest in the history of computing was kick-started by my coming across the then almost unknown work of Percy Ludgate.
		This was over thirty years ago, when I was preparing an inaugural lecture, and led on to my producing the book "The Origins of Computers", and to my investigating the Colossus wartime code-breaking machines.
		Most recently I've provided, on request, an article on Percy Ludgate to the Dictionary of Irish biography, and have done some investigation of a little-known early Scottish calculating device, the Rotula Arithmetica, having happened to stumble across one of the few surviving examples in a small Scottish museum while on holiday.
	www.tomandmaria.com /tom/Resources/historians.php (7672 words)

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