Hughes Marine Bubble Sextant
The National Maritime Museum has in
their collections a Marine version of the Aero Mk IX sextant.
These sextants were produced post war
and several of them exist in Marine environments The averager
is wound by pressing a lever, a much better method as far as an
operator is concerned. The mechanism of the averager itself is
similar to the Plath mechanism. I have not yet been able to get
my hands on one so can comment no further.
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types