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I have an SNO-T (which may be or may not to be
super-quality). The drum is divided into whole minutes,
and has no vernier (nonius).
I have no difficulty in reading it to 0.1' precision.
When I compared it with Bills Astra 3 (which has a nonius
divided to 0.2') I did not find Astra easier to read.
My impression is that reading the drum without nonius
is quicker and more convenient than the one with a nonius.
This might answer your question.
P.S. Unlike all other modern sextants, SNO-T
has a magnifying glass helping to read the drum.
But no nonius.
On Wed, 15 Jun 2005, Mike Burkes wrote:
> I have always wondered why super quality sextants like some Plaths and others
> do not have their minute scales further divided into tenths.
> I would appreciate any feedback regarding that and thanks much!
> Mike Burkes
