Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: sextant precision.
    From: George Huxtable
    Date: 2005 Jun 23, 10:37 +0100

    In an old Brown's Almanac (for 1988) there's an advertisement for B. Cooke
    & Son Ltd, Kingston Observatory, 58/59 Market Place, Hull, England.
    Opposite the page showing their Cooke "Kingston" Micrometer Sextant is a
    description and photo of the "Cooke" Plath precision Collimator, about
    which the text says-
    "Reading to one second of arc is used in the final testing of our Kingston
    A reliable sextant continues to be the one indispensable instrument of the
    navigator. The quality of the instrument is dependent on the skill of the
    craftsmen, instrument makers and opticians alike, sharing in the task of
    reaching perfectrion.
    Navigators generally, have little knowledge of Sextant Manufacturers'
    testing devices, which have been developed until, at last, the perfect
    instrument is in being.
    We cordially invite any navigator, when in Hull, to bring his sextant to
    our factory and see it tested on this precision instrument."
    The photo shows a very glossy device, but is a bit inscrutable, in that I
    can't even work out where the sextant goes. But if anyone is interested,
    I'm happy to scan it and send a copy to anyone who asks.
    Cooke's are still in business; they supply my wife with weekly Admiralty
    "Notices to mariners" from which she keeps our charts up-to-date.
    I phoned them to ask if they still calibrated sextants, and indeed they do.
    I spoke to Harry, who told me that he was long-retired, but was called in
    when they had a sextant job to do, so happened to be there that day. He
    also told me there was a limited stock of replacement parts for sextants,
    and that resilvering could be done.
    The sting in the tail came when I was transferred to the office to tell me
    their prices. I was told to expect a bill of ?160 to ?200, depending on
    what work was needed. I think that ?1 corresponds to about $1.85 at present.
    Cooke's email address is bcs@cooke.karoo.co.uk, their phone number is 01482
    223454 or from abroad +44 1482 223454. They don't have a website.
    Contact George at george@huxtable.u-net.com ,or by phone +44 1865 820222,
    or from within UK 01865 820222.
    Or by post- George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13
    5HX, UK.

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site