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Re: The Observer’s Book on Astro-Navigation - Coutinho sextant
From: Gary LaPook
Date: 2016 May 2, 08:26 +0000

Look at page 187 of "Precision Astrolabe" that I previously posted.

gl
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On Sat, 4/30/16, David Pike  wrote:

 Subject: [NavList] Re: The Observer’s Book on Astro-Navigation - Coutinho sextant
 To: garylapook@pacbell.net
 Date: Saturday, April 30, 2016, 4:43 PM

 BillIt would be very useful if in addition to
 your other excellent photos you could get a photograph of
 the view of the bubbles down the eyepiece to supplement the
 diagrams on page 163 of 'Taking the Stars'.  Also 1, does the Coutinho require fiduciary marks
 for the longitudinal bubble, or is the radius of the level
 cunningly matched to something?  Also 2, how does the Coutinho allow
 for the fact that the body is focused at infinity, and the
 levels are about nine inches in front of the observer’s
 face?  DaveP

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