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Bill and Fred,
Here I post some observations with my MkIXa bubble sextant.
I will appreciate very much if someone who also practices
bubble horizon observations will compare these data with his/her own.

March 7, Sun alt.
Without averager. Errors: 5.6, -0.6, -2.3 2.0, -1.4, -1.7, 0.6, -4.1,
-1.7. Average error: -0.4, sigma=2.8.
(Bill: this is a  good example of how averaging works:
the individual results are so-so (as shown by the sigma)
but the average is excellent).

March 7, Venus alt, with averager. Error 2.6.
Without, errors: -3.0, 1.2, -1.9, -3.1, Average error -1.7, sigma=2.

Febr. 20 Moon alt, with averager. Error 3.7.
Without averager, error -1.6.a

Febr. 20 Venus alt, without averager,
errors 0.9, 1.9, -1.0, 0.1, -0.8, average 0.22, sigma 1.2

Febr. 20, Sun alt. with averager, error 0.3,
Without averager: errors -3.5, -2.7, -3.4, -4.1, 0.0, -2.8.

I will be very interested if someone compares these results
with his/her own observations with bubble horizon.
Especially interesting is to know the performance of Cassens-Plath
bubble attachment. For its price (at Celestaire) one can have 10 or 15
aircraft sextants from e-bay, and surely several of them will work:-)
And the weight is probably comparable (if you cut off the averager,
of course:-)

Alex.


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