NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: "Lost Motion" Question
From: Alexandre Eremenko
Date: 2006 Jul 22, 03:59 -0500
Dear Frank,
This statement is very interesting (and misterious):
> I'll have to dig up the reference on this,
> but it's interesting to note that
> the earliest references to backlash come from the 18th century
> --long before
> the micrometer.
Please post the reference when you dig it out.
When I think of the construction of the usual vernier sextant
I cannot imagine any backlash in its operation,
and I don't see how friction of the arm
against the arc can be relevant.
Maybe they (and you) mean that the arm of the sextant
gets slightly bent in a direction parallal to the arc,
because of the friction in the pivot?
Alex.
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From: Alexandre Eremenko
Date: 2006 Jul 22, 03:59 -0500
Dear Frank,
This statement is very interesting (and misterious):
> I'll have to dig up the reference on this,
> but it's interesting to note that
> the earliest references to backlash come from the 18th century
> --long before
> the micrometer.
Please post the reference when you dig it out.
When I think of the construction of the usual vernier sextant
I cannot imagine any backlash in its operation,
and I don't see how friction of the arm
against the arc can be relevant.
Maybe they (and you) mean that the arm of the sextant
gets slightly bent in a direction parallal to the arc,
because of the friction in the pivot?
Alex.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
