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    Re: Sextant or Range-finder
    From: Stephen N.G. Davies
    Date: 2016 Mar 14, 10:42 +0800
    They were originally called ‘sextant rangefinders’, which may explain why it was advertised as it was. They first appeared in 1914 and went through seven Marks by 1918 to improve its performance. It was never very accurate, but was still part of Royal Navy bridge equipment in the early 1960s when I can recall using one for station keeping when in formation. http://www.dreadnoughtproject.org/tfs/index.php/Waymouth-Cooke_Rangefinder has some drawings illustrating construction.
    Stephen D

    Dr Stephen Davies
    c/o Department of Real Estate and Construction
    EH103, Eliot Hall
    University of Hong Kong

    Office: (852) 2219 4089
    Mobile: (852) 6683 3754 

    stephen.davies79---.com
    daiwaisi{at}hku.hk


    On 13 Mar, 2016, at 3:23 am, David Pike <NoReply_DavidPike@fer3.com> wrote:

    Has anyone any idea what this is and how it works? http://www.ebay.com/itm/WWI-1914-Air-Sextant-Mark-II-Waymouth-Cooke/222041411459   Also, if it’s measuring waterline to mast-top angle to get range, why not use it on its side and use length?  It would be more accurate.  Oh! I suppose you’d need to be dead abeam the target.  DaveP

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