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On 15 Jun 2005 at 18:44, Frank Reed wrote:

> I've also noticed that some Plath sextants don't  include a little vernier
> scale for reading off tenths of minutes. But in  practice, I find that this
> matters relatively little. I can read to 0.2 minutes  (which is as good as
> it gets, in my practical experience) with or without the  vernier scale.

It's the same with my Tamaya. When I first got it I thought about adding
some vernier ticks (although since the zero mark is centered I would have
had to make plus and minus ticks). It didn't take long to realize that
estimating the fractional minutes to the nearest 5th, or even 10th, was
quick, easy, and not likely to be the limiting factor in my observations
for many years to come.

Ken Muldrew.

   

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