User:The Anome/Irish logarithms

''Note: this is an article draft. It is intended to be specifically about the multiplication method, not Ludgate himself or his computer design overall.''

Irish logarithms were a multiplication system designed by Percy Ludgate for his proposed mechanical computer. The name "Irish logarithms" was coined by Ludgate's contemporary C. V. Boys. The mechanism used a table of index numbers (the "logarithms" of the name) to convert multiplication to a set of addition operations, generating partial products that could then be used to produce the final results.

Further reading: missing
D. Riches (1973). An Analysis of Ludgate's Machine Leading to a Design of a Digital Logarithmic Multiplier, Dept. of Electrical and Electronic Engineering, University College, Swansea (June 1973). 94p.

Further reading: online

 * http://www.cs.ncl.ac.uk/publications/trs/papers/164.pdf
 * http://www.cs.newcastle.ac.uk/research/pubs/articles/papers/398.pdf -- good!
 * http://www.fano.co.uk/ludgate/Ludgate.html -- quotes Ludgate directly
 * http://history-computer.com/Babbage/Documents/ON%20A%20PROPOSED%20ANALYTICAL%20MACHINE.html -- Ludgate's original paper?
 * http://www.cs.ncl.ac.uk/research/pubs/articles/papers/390.pdf
 * http://www.worldcat.org/title/origins-of-digital-computers-selected-papers/oclc/851376704
 * https://sites.google.com/site/calculatinghistory/home/irish-logarithms-1/irish-logarithms-part-2-1/jacobi-indices -- mentions Jacobi indices -- proving difficult to find other refs for this term
 * except perhaps this: page 20 of http://www.rechnerlexikon.de/files/HoeckMult.pdf
 * http://www.oughtred.org/jos/FaberModel343_PeterHolland.pdf -- the Schumacher slide rule, working on the same principle