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    Re: Periscopic Sextant. Henry Hughes and Son
    From: Mike N
    Date: 2009 Jul 30, 13:35 -0700

    I have a USAF type periscopic Kollsman D-1 sextant that requires 28
    volts for the averager to work.  I tried wiring three 9-volt batteries
    in series but the averager needed more power than the three batteries
    provided.  I then copied the arrangement twice and then wired the
    three series of three in parallel and it worked.  However, there's
    significant power drain and the thing is only good for 2 or 3 shots.
    
    Mike Nelson
    Herndon, VA
    
    On Jul 29, 6:58�pm,  wrote:
    > Sorry not to reply until now. I have only just found you request. I only look infrequently here.
    >
    > Mine is a MkI Hughes periscopic. I would expect them to all have the same 
    connections with later Mark sextants.
    > There are three pins in a socket, the centre pin being common (Case, earth). 
    �When looking at the pins from the back of the sextant (eyepiece away from 
    you) the left pin is 3V for the bubble lighting, and the right pin is 28V DC 
    for the averager motor. In fact it works from about 12V upwards.
    >
    > I have a battery holder for two 1.5V cells which plugs straight into the 
    socket enabling the sextant to be used for single shot sights, hand held, 
    (heavy!) but without the averager. In fact I stand it on a suitable surface 
    at the right height.
    >
    > I have powered the averager from a separate power supply to check it and for 
    the fun of it, but do not use it in anger for sights.
    >
    > The power arrangements were designed for use with the aircraft fuselage 
    mounting and power supply when connected of course.
    >
    > Douglas Denny.
    > Chichester England.
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