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Subject: Pillar Sextant
From: Fred Hebard (Fred@XXX.XXX)
Date: Tue Apr 01 2003 - 12:38:29 EST
There is a very nice Troughton circular sextant with pillar on ebay.
It was just listed about 1 pm pst yesterday, and has gone from $100 to
$1575 with 17 bids by 9:30 am pst today.
There are numerous pictures.
From what I can tell looking at the vernier, the instrument appears
capable of measuring to 20 seconds of arc by direct reading.
Interpolation could lower that to 10 or 5 I suppose. The text says 5
seconds. From the text, it appears the author knows what he's talking
about, so I suppose 5 seconds is about right.
Fred
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