On 2007-08-23 01:53 +0100, Olly Betts wrote: > I think a "hidroniveler" must be a barometer in English
I think it is actually a 'hydrolevel', which is a specialised version of a barometer/altimeter/depth gauge. These all funamentally amount to the same thing so far as survex is concerned either absolute or difference height readings, although in practice their readings may come in different forms which need to be allowed for (such as absolute vs difference). Certainly the calibration requirements for high-altitude hyrdolevelling are quite different from those for conventional instruments. For details See the (evolving) article on Hydrolevelling Krubera in various journals: AMCS Activities Newsletter, no. 29, October 2006 issue of Compass and Tape (vol. 17, no.3, issue 59), Summary in Compass Points 36, and (IIRC) a less geeky version in a recent Speleology (but not the #8 I can lay my hands on right now), and a forthcoming one in CP 38 wih more of the tech details in. Wookey -- Principal hats: Balloonz - Toby Churchill - Aleph One - Debian http://wookware.org/
