If you want a real timekeeping challenge then build your own hydrogen maser= .. On 24 July 2014 09:30, wrote: > > > Ever run across one of these? > > > > > > http://en.wikipedia.org/wiki/Synchronome > > > > I've seen an article about a super-accurate lab clock with a pendulum i= n > a > > vacuum, so it's probably that one although I didn't remember the name > > > > There are horologists who spend waaaaaaaaaaaaay more time than I do on > > some very elaborate mechanisms. I'm not devoted to any particular past- > > time, I dabble all over the place > > You mean like John Harrison ? > http://en.wikipedia.org/wiki/John_Harrison > > > -- > Scanned by iCritical. > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .