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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextant precision, SNO-T
From: Fred Hebard
Date: 2004 Oct 4, 19:29 -0400
From: Fred Hebard
Date: 2004 Oct 4, 19:29 -0400
On Oct 4, 2004, at 6:08 PM, Alexandre Eremenko wrote: > Dear Fred, > > By the way, your table shows pretty large variation of the index > error from day to day. This seems surprising to me. > Is this what it should be? Is this related to the air temperature? >> >> I started out with >> inferior equipment to what you have, > > ?????? What do you mean? Cassens and Plath? > Or Husun? In the table you sent me you seem to mention > Cassens-Plath, if I understood your abbreviation "C+P" correctly, > which everyone says is the top sextant of those still produced. > > When I was deciding what to buy as my first sextant, the choice > was essentially between a 1945 "Gothic" Husun (full size > brass frame, > two scopes) and a "new" 1990 SNO-T which was cheaper. > I think I decided for SNO-T for some sentimental reasons, > as a former Soviet citizen, etc:-) > > > Alex. Alex, The large variation in index error from day to day is associated with a weak spring in the horizon mirror, I hope! I started out with a $35 Davis sextant, then went to a Husun which had a broken handle. I may have uncentered the index while trying to remove the handle. In an effort to get a more powerful telescope, the Husun's was 2.5x, and more accuracy, I then bought a _used_ Cassens and Plath. Although I have not examined one, I believe a Tamaya Spica would be the top sextant of those produced today in the old non-communist countries, from what I hear. Cassens & Plath are very accurate and precise, but there are some failings with them which I have outlined previously; others also have commented on some failings in their bubble horizon attachment, in comparison to a C. Plath (note that C. Plath is a different company from Cassens & Plath). The Cassens & Plath is good enough, however! In sextants from the old communist block, the Friburger and Sno sextants have good reputations, and from what I hear, may be as good as the Tamaya and C+Ps. Thus I am not sure that the Cassens & Plath is superior to your instrument, but I agree it would not be noticeably inferior. Many of us who do not speak Russian are leery of buying from Russia, having heard some horror stories. It is difficult for us to assess the honesty of the various dealers. Fred