NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Fixes consistantly south and west of GPS
From: Peter Monta
Date: 2014 Nov 16, 21:43 -0800
http://www.mcmaster.com/#starrett-levels/=umn69f
Cheers,
Peter
From: Peter Monta
Date: 2014 Nov 16, 21:43 -0800
McMaster-Carr lists a few mounted vials (20 arcsec and 6 arcsec):
http://www.mcmaster.com/#2160a5/=umn1t8
http://www.mcmaster.com/#2160a2/=umn1tx
There's also a replacement vial for the Starrett "199Z Master Precision" level, around 9 arcsec assuming they use the 2mm sensitivity convention:http://www.mcmaster.com/#2160a5/=umn1t8
http://www.mcmaster.com/#2160a2/=umn1tx
http://www.mcmaster.com/#starrett-levels/=umn69f
Maybe vials extracted from surplus theodolites, striding levels, non-automatic surveying levels, etc. could be used if they can be obtained cheaply.
Peter
