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    Re: Calibrating a sextant scale
    From: Geoffrey Kolbe
    Date: 2007 Nov 25, 06:25 +0000

    The manufacturer of the theodolite is the Urals Mechanical and Optical 
    Plant, situated in Ekaterinburg (formerly Sverdlovsk) in the Urals, Russia. 
    The type of theodolite is the 3T2KP. They are very much still in business - 
    they employ 20,000 people! See http://www.airshow.ru/expo/304/prod_25.htm
    
    I too have one of their theodolites, a type 2T30P, which was given to me in 
    a ruinous, non-working state by a French friend. I took it to bits and 
    restored it to back to health (not a project to be undertaken lightly!) and 
    it now works very well. I made some attachments to illuminate the scales 
    and the cross hairs in the dark, so that it can be used to measure star 
    altitudes. Also a solar filter for the front lens using two glass neutral 
    density filters totalling 5.0. (My retina is still fine...) to enable me to 
    measure altitudes and azimuths of the sun. It only reads to five minutes, 
    though the scale is large enough that it is easy to interpolate to one 
    minute, and the telescope is 30x so it is easy to measure to one minute. 
    But its great asset is its weight - just two kilograms (four and half 
    pounds) so lugging it around the Scottish countryside to survey prehistoric 
    stone circles is not a problem.
    
    Geoffrey Kolbe
    
    
    
    At 20:55 24/11/2007, you wrote:
    
    >Alexandre E Eremenko wrote:
    > >
    > > Can you write this in Latin characters:
    > >
    > >>I own a Russian theodolite (ТЕОДОЛИТ 3Т2КП
    > >>on the cover of the manual)
    > >>which reads to 1 second.
    > >
    > > My conputer display does not read my natice Cyrillic
    > > in e-mails:-)
    >
    >The first word is Te Ie O De O El I Te. The second word is 3 Te 2 Ka Pe.
    >I used Windows Character Map to get the names of the characters (and to
    >write Cyrillic in the earlier message). Not being a Russian speaker, I
    >may have made some mistakes. E.g., Cyrillic has a letter which resembles
    >digit 3.
    >
    >
    > > Not suprsising that they are out of business.
    > > How many years ago did it
    > > cost $1200 new?
    
    
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