NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Coastal Plotting Sheets
From: Nicol�s de Hilster
Date: 2007 Mar 18, 10:52 +0100
From: Nicol�s de Hilster
Date: 2007 Mar 18, 10:52 +0100
The "1979 Observator geodetic sextant" differs from a "normal sextant" in the way the circle is divided. Where a normal sextant is divided in degrees (so 360 units to a full circle) the geodetic sextant is divided in gon (or grad) that have 400 units in a full circle. In The Netherlands the 400 grad system is widely in use, resulting in lots of geodetic equipment with this type of circles (see the Wild T2 theodolite in my collection). The geodetic sextant was especially made for geodetic network measurements. P F wrote: > > > Nicol�s wrote: > > > For this purpose a nice instrument was constructed: the protractor or > "station pointer"... > > Examples of the instrument can be found on my web-site: > http://www.dehilster.info/instrumenten/stationpointer1/index.html > http://www.dehilster.info/instrumenten/stationpointer2/index.html > > > Ingenious - two instruments designed specifically for this purpose. > Wish I had one; it should be much quicker and more efficient than > plotting lines from shore features seawards. > > Browsing through your collection, in what way does a "1979 Observator > geodetic sextant" differ from what I imagine as a 'normal' sextant? > > > > > ------------------------------------------------------------------------ > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.446 / Virus Database: 268.18.12/724 - Release Date: 16/03/2007 12:12 > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---