Re: Dividing the Circle
named, Blackwells claims to have a new copy. I sent them an on-line order, received an acknowledgment, received confirmation of charging my credit card and then received a curious email explaining that shipment would take 30 days, based on average response from the publisher. I don't understand this and I sent an email asking for explanation but have so far received no reply. Do you know Blackwells? I'm hopeful that it is a reputable store. Blackwell's is one of the largest bookstore chains in the UK, and is completely reputable. The response you got is typical for works in limited print runs. You'll be fine. -- Bill Thayer http://tinyurl.com/iquh -
re: dividing the circle
There's an excellend discussion and description of a measuring instrument made by the Moore Special Tool co. which is accurate to 0.1 second of arc. See the book: "Foundations of Mechanical Accuracy" by Wayne C. Moore published by the company in Bridgeport CT. in 1970. See: http://www.thomasregister.com/olc/44626000/publicat.htmand http://www.thomasregister.com/olc/44626000/1440.htm The index and dividing tables are still made Moore made wonderful measuring machines built by hand scraping could measure anything in an approximate volume of 1' by l'-6"byl'-6" to an accuracy of 25 millionths of an inch. The book described in beautiful detail how the measuring machines were made. These days this type of measurement is done by laser and the measuring machines are much simpler. See for example: http://www.brownandsharpe.com/ Fred Jaggi
re: dividing the circle
Fred Jaggi contributed: These days this type of measurement is done by laser and the measuring machines are much simpler. See for example: http://www.brownandsharpe.com/ A fascinating link, especially for me the history of Brown and Sharpe. We owe so much to such pioneers of precision. Thanks Fred Tony Moss -
