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    Re: Sextant calibration. Re: Coordinates on Cook's maps
    From: Jim Martin
    Date: 2007 Apr 24, 16:24 -0700

          My Alpha 40(Chinese)has stamped on the correction certificate
    "This instrument is free of errors for practical use"
                                 Jim Martin.
    On Apr 23, 4:57 am, Alexandre E Eremenko 
    > On Sat, 21 Apr 2007, Gary J. LaPook wrote:
    > > My Tamaya MS-833 serial number 63890 which I bought new in 1981 has all
    > > zeros.
    > Which confirms what I said about the results of my
    > e-bay research.
    > What else, after 1940, except some Tamayas,
    > has a certificate
    > with all zeros? Can the list members give me ONE example?
    > C. Plath and
    > Cassens Plath are
    > not considered because they DO NOT provide a certificate
    > with a list of errors.
    > I have a wild guess: this depends on whether
    > the manufacturer has testing equipment or not:-)
    > Freiberger and SNO do have the equipment (I know!),
    > so they provide certificates with errors listed.
    > They are usually not all zeros.
    > Alex.
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