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George,

> I can't read anything without doing
> my best to probe it for
> errors, or pick holes in its arguments.
> It's a negative, and rather
> destructive, trait,

Not always. As I said this makes a perfect referee.
My professional duties include refereeing papers
for math journals, as well exam grading
and reading my student's research papers.
Tnd this sort of activity also
developed in me the same trait. Whatever I read I always
automatically mark all mistakes or misprints on the margins,
even if this is fiction:-)

> I mean, that the Cassens-Plath was divided into
> sixths of an arc-minute, and the SNO-T into fifths.

No. Nobody divides to 6-ths nowadays,
because seconds are not used. All use the tenths of
a minute, including the almanac.
Cassens-Plath is
divided to
fifths or tenths
and in SNO-T the minutes are not divided at all.
all.
Like on many C. Plaths of 1950-s.
The smallest markings are 1'.
But the distance between the markings is so large that
it is easy to interpolate even with naked eye to 0.1'
In addition there is a microscope on SNO-T
(a unique feature for drum sextants, as I understand).

Alex.


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