Hi Fons, The weakness of the system is not the precision of the bubble location, which is almost perfect, but the human’s uncertainty due to bubble curvature, refraction, etc. I think the graphic perfectly demonstrates that: https://pixabay.com/photos/spirit-level-tool-craft-to-build-2081193/
Best, Tim ♪ ♫ ♪ ♫ ♪ ♫ ♪ ♫ ♪ ♫ ♪ ♫ ♪ ♫ ♪ ♫ Dr. Tim Ziemer Bremen Spatial Cognition Center University of Bremen 28359 Bremen Office: Cartesium 3.13 Enrique-Schmidt-Str. 5 Fon + 49 (0) 421-218-64280 Fax + 49 (0) 421-218-64239 zie...@uni-bremen.de https://bscc.spatial-cognition.de/ziemer > On 1. Mar 2022, at 14:11, Fons Adriaensen <f...@linuxaudio.org> wrote: > > On Tue, Mar 01, 2022 at 01:11:52PM +0100, Tim Ziemer wrote: > >> Errors of more than one degree are very common. > > Where do you get that ? Just look up some specs. Even a cheap > (20 Euro) plastic bubble level can have a sensitivity [1] of > 1/2000 (0.03 degrees). > > Absolute accuracy is easy to check, just turn the level by > 180 degrees. > > Those used by e.g. surveyors (still analog 'bubble') can be > orders of magnitude better. > > Most people have absolutely no idea of how accurate old-school > analog things can be. Manufacturing and use of some of those > is based on hundreds of years of experience. > > [1] Sensitivity is the inclination required to move the bubble > by one graduation line. Graduation lines are typically 2 mm > apart. > > Ciao, > > -- > FA > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit > account or options, view archives and so on. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20220301/f9632064/attachment.htm> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
