Sanjeev, > That sounds like the Repeating Theodolite, used for the > survey from Dunkirk <-> Paris <-> Barcelona
Exactly! Thanks for your help Ulrich > -----Ursprungliche Nachricht----- > Von: [email protected] > [mailto:[email protected]] Im Auftrag von Sanjeev Gupta > Gesendet: Samstag, 22. August 2009 10:56 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] Measurements > > > On Sat, Aug 22, 2009 at 15:19, Ulrich Bangert > <[email protected]>wrote: > > > Which in turn lead to the invention of a new class of surveyor > > instruments, which in turn enabled the French to measure > the distance > > from the equator to the north pole (assumed to be 1/4 of the > > circumference) with a precision that must be admired even > from a today > > point of view. I do not know the english term for it but in German > > these instruments are called "Repetitionskreis". You can > find a pictue > > of one here: > > > > > > > http://www.bistumsmuseen-regensburg.de/html/ausstellungen_moenche_repe > > tition > > > skreis.htm<http://www.bistumsmuseen-regensburg.de/html/ausstel > lungen_moenche_repetition%0Askreis.htm> > > > > That sounds like the Repeating Theodolite, used for the > survey from Dunkirk <-> Paris <-> Barcelona > > http://en.wikipedia.org/wiki/Repeating_circle > > The basic idea is to mark out repeatedly the angle to be > measured, but actually measure the sum, _only_ at the end, > which you then divide. It gives you the arithmetic mean of > the value directly. The major advantage over doing this > mechanically, rather than adding it up in your notebook, is a > that you have reduced the least-count of your graduated scale. > > > -- > Sanjeev Gupta > +65 98551208 http://www.linkedin.com/in/ghane > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
