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    Re: question on air sextant MKIX
    From: Geoffrey Kolbe
    Date: 2007 Feb 12, 06:31 +0000

    Alex - I have a Mk IX bubble sextant and the modern type C batteries
    fit in fine with room to spare. Do you have a Mk IX bubble sextant
    and are you saying modern C batteries do not fit into it?
    
    Or are you confusing the British made Mk IX with the American made
    Link A-12, which will not accept the modern C cell?
    
    Geoffrey Kolbe
    
    At 01:44 12/02/2007, you wrote:
    
    
    >Size C won't provide as much amperage over time as the Ds; ie, they
    >won't last as long.  The Ds also can supply more peak amperage, but
    >that usually isn't a consideration with lights.
    >
    >Alkaline batteries usually last longer than carbon-zinc batteries,
    >but there can be subtle changes in size that can make them less
    >suitable.  Everready "Classic" batteries are the old-type carbon zinc
    >for which American instruments would have been designed.
    >
    >Fred
    >
    >On Feb 11, 2007, at 8:04 PM, alex wrote:
    >
    > >
    > > As I understand the batteries exactly fitting this sextant MkIX
    > > are not produced anymore.
    > > What sort of batteries can be used?
    > > My (superficial) investigation shows that C-size batteries
    > > are likely to fit in diameter. How many are needed?
    > > The batteries only have to feed 2 bulbs.
    > > Are these 3 volts or 1.5 volts bulbs?
    > >
    > > In general, what is the difference between size C and size D
    > > batteries? Both are 1.5 volts, but size C is smaller.
    > >
    > > Alex.
    > >
    > >
    > > >
    >
    >
    >
    Border Barrels Ltd, Newcastleton, TD9 0SN, UK
    Tel: +44 (0)13873 76253   Fax: +44 (0)13873 76214
    
    
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