Astro Compasses
The original British version and a
later American (Spirti) version.
Note that the only difference is in
the shape of the Head unit.
There is yet another version which
I had forgotten about till looking through my data. Marked with
D.E.P. Co. Of Canadian manufacture, Thanks to a visitor
to this site I have some photographs of the instrument.
Yet again a slightly different Head
Assembly. Even tighter corners compared to the British Version.
Many thanks to Johannes M. Vogt for the above photos.
I think taken at the AERO SPACE MUSEUM CALGARY ALBERTA
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