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    Re: question on air sextant MKIX
    From: Fred Hebard
    Date: 2007 Feb 11, 20:44 -0500

    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.
    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.
    > >
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