NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Calibrating a sextant scale
From: Alexandre Eremenko
Date: 2007 Nov 24, 11:25 -0500
From: Alexandre Eremenko
Date: 2007 Nov 24, 11:25 -0500
Dear Richard, > one "WILD T2 T-2 THEODOLITE > Winning bid: US $367.67 Well, it happens. I am extremally unlucky with e-bay, If I do not bid, the things go cheaply:-) But whenever I bid, it seems that someone is willing to match whatever price I bid for:-( > Did you run into the Soviet > version of the mil, at 6000mils to the circle? Yes, during my brief service in the anti-aircraft artillery. All Soviet land-based artillery used this system of angle measurement. In the gun sights, radars, "The Device", compasses, range-finders etc. No degrees anywhere. It was simply called "one angular division" or "one thouthands" in literal translation from Russian. The rule was that you see an object of size 1 meter at 1 kilometer distance under the angle "one division"=1/6000 part of the circle. That is they assumed that pi=3 for mental calculations. ("The Device", of course performed calculations exactly). The airforce and navy used degrees, so there were communication problems when any interaction was required:-) Alex. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---