http://tech.groups.yahoo.com/group/sliderule/ The International Slide Rule Group Sun, 08 Nov 2009 02:20:39 GMT Mark Armbrust http://tech.groups.yahoo.com/group/sliderule/message/38082 http://tech.groups.yahoo.com/group/sliderule/message/38082 Nice pictures of a cool looking slide rule that I can't afford (currently GBP721 ~ $1200)! ebay Item number: 330372700789 --Mark Sun, 08 Nov 2009 00:56:05 GMT Cyril Catt http://tech.groups.yahoo.com/group/sliderule/message/38081 http://tech.groups.yahoo.com/group/sliderule/message/38081 ...from what I can see, it is only a tachymetre. Cyril Catt Sun, 08 Nov 2009 00:50:01 GMT wee-meng lee http://tech.groups.yahoo.com/group/sliderule/message/38080 http://tech.groups.yahoo.com/group/sliderule/message/38080 Hi, I just came across a very affordable slide rule watch from Invicta that looks exactly like CItizen's Nighthawk and costs USD 70 with shipping! Unlike Sun, 08 Nov 2009 00:16:22 GMT Stefan Vorkoetter http://tech.groups.yahoo.com/group/sliderule/message/38079 http://tech.groups.yahoo.com/group/sliderule/message/38079 ... Or you can click Adobe Reader's "rotate right" (Ctrl-Shift-'+') or "rotate left" (Ctrl-Shift-'-') buttons. -- Stefan Vorkoetter http://www.stefanv.com Sat, 07 Nov 2009 19:02:58 GMT dfsmth45 http://tech.groups.yahoo.com/group/sliderule/message/38078 http://tech.groups.yahoo.com/group/sliderule/message/38078 The solution only has 2 digits because you must add in the -1 correction which occurs because the product lies to the right of the first factor, but is on the Sat, 07 Nov 2009 18:31:37 GMT John Starr http://tech.groups.yahoo.com/group/sliderule/message/38077 http://tech.groups.yahoo.com/group/sliderule/message/38077 I'm going to answer my own question.  I know that you do not want to be too vigorous in dealing with scratchs on this particular metal surface. I tired some Sat, 07 Nov 2009 18:30:55 GMT fwonghc http://tech.groups.yahoo.com/group/sliderule/message/38076 http://tech.groups.yahoo.com/group/sliderule/message/38076 I don't know if I misunderstand your method. (I read some books many years ago, but forget the exact detail, though I can recall that method, and it was not Sat, 07 Nov 2009 14:56:30 GMT Charles Oxford http://tech.groups.yahoo.com/group/sliderule/message/38075 http://tech.groups.yahoo.com/group/sliderule/message/38075 what about the paper trade in rule? I thought there was shortage during wartime but kercs cursors are very common. Sat, 07 Nov 2009 13:29:27 GMT dfsmth45 http://tech.groups.yahoo.com/group/sliderule/message/38074 http://tech.groups.yahoo.com/group/sliderule/message/38074 Bob, I've got a pdf of Johnson's book on my computer, but have never gotten around to reading it (it's one long pdf, not separate pages and comes out sideways Sat, 07 Nov 2009 13:23:55 GMT Maynard Wright http://tech.groups.yahoo.com/group/sliderule/message/38073 http://tech.groups.yahoo.com/group/sliderule/message/38073 In fact, the really useful McCoy site shows the 4055 as being manufactured from 1927 until 1943: http://mccoys-kecatalogs.com/KEModels/ke4055family.htm Patent Sat, 07 Nov 2009 06:30:48 GMT w9ya http://tech.groups.yahoo.com/group/sliderule/message/38072 http://tech.groups.yahoo.com/group/sliderule/message/38072 Actually the freedom from the restrictions (choice in use) you mention below are the very same restrictions that Johnson mentions in his classic book. Further Sat, 07 Nov 2009 04:55:53 GMT Clark McCoy http://tech.groups.yahoo.com/group/sliderule/message/38071 http://tech.groups.yahoo.com/group/sliderule/message/38071 There were about a million rules with the 1900 patent date and every eBay seller claims that was when it was produced. Rules all the way up to 1936 had this Sat, 07 Nov 2009 04:13:31 GMT Jon Jones http://tech.groups.yahoo.com/group/sliderule/message/38070 http://tech.groups.yahoo.com/group/sliderule/message/38070 Ebay item #380175405160 claims to be from 1900 - I know that is wishful thinking, but isn't this one of the later improved cursors that don't suffer from Sat, 07 Nov 2009 04:13:12 GMT Jon Jones http://tech.groups.yahoo.com/group/sliderule/message/38069 http://tech.groups.yahoo.com/group/sliderule/message/38069 I've used a wire brush on Picketts, although this is not really removing scratches, more like creating thousands more! Still, it gave it a brushed look that I Sat, 07 Nov 2009 02:44:45 GMT dfsmth45 http://tech.groups.yahoo.com/group/sliderule/message/38068 http://tech.groups.yahoo.com/group/sliderule/message/38068 John, I don't know what to recommend for scratches except possibly a fine ScotchBrite pad. I have used NeverDull polish (available in auto parts stores)