On Sat, 16 Jun 2012 23:03:44 +0300, you wrote: >2012/6/16 andy pugh <bodge...@gmail.com>: >> >> You are quite right, I don't know how I got that wrong. >> Except that hecto and centi are _not_ prefixes in the SI system. >> > >Could be, I do not know for sure... > >BTW the metric vs imperial systems and UK being somewhere inbetween >(litres from metric system and miles from imperial), I just remembered >one interesting moment from a metrology class: >In whole mainland Europe screw threads are metric, pipe threads are in >imperial units. Which does not make much of a sense to me, why would >they be separated, but then professor mentioned that pipe threads in >UK are not imperial (I _think_ that screw threads are imperial in >UK)... >So I think that pipe thread in UK has to be metric, which makes me >think that English people are doing this on purpose :))
Pipe threads are Imperial Units - BSP (British Standard Pipe) and have a Whitworth thread form. Have a read up on Joseph Whitworth - He displayed a machine in 1855 that could measure to an accuracy of one millionth of an inch. He was also the guy who defined a standard thread 1841 to aid the speed of manufacture. Steve Blackmore -- ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
