NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: It's time to do it.
From: Bill B
Date: 2006 Jul 27, 01:21 -0500
Robert wrote:
> I had the same concerns, however, it appears to me that the pressure from
> the top lid is exerted on the telescope and not the index and horizon
> mirrors.
PS. Just looked at the setup. Sextant is Astra IIIB. The lid foam is in
two layers. The foam closest to the sextant is cutout around the entire
sextant. Only the rubber eyecup protrudes past that cutout.
Eyeballing heights relative to the top, the majority of the scope is
nominally lower than the other components.
Lowest to highest:
Scope/Index mirror frame about equal (front of scope perhaps a tad higher
than index-mirror frame, the majority lower)
Index shades and lugs
Horizon mirror and spring
Horizon shades and lugs
(Horizon shades, not counting lugs, a wee bit lower than horizon mirror
frame)
Therefore the maximum pressure is exerted on the horizon mirror spring, then
frame.
Bill
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
From: Bill B
Date: 2006 Jul 27, 01:21 -0500
Robert wrote:
> I had the same concerns, however, it appears to me that the pressure from
> the top lid is exerted on the telescope and not the index and horizon
> mirrors.
PS. Just looked at the setup. Sextant is Astra IIIB. The lid foam is in
two layers. The foam closest to the sextant is cutout around the entire
sextant. Only the rubber eyecup protrudes past that cutout.
Eyeballing heights relative to the top, the majority of the scope is
nominally lower than the other components.
Lowest to highest:
Scope/Index mirror frame about equal (front of scope perhaps a tad higher
than index-mirror frame, the majority lower)
Index shades and lugs
Horizon mirror and spring
Horizon shades and lugs
(Horizon shades, not counting lugs, a wee bit lower than horizon mirror
frame)
Therefore the maximum pressure is exerted on the horizon mirror spring, then
frame.
Bill
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
