NavList:

George,
I saw your message just after I wrote my own one.
(I am currently sorting the mail that accumulated
after a one-week vacation).

Alex

On Sat, 22 Jul 2006, George Huxtable wrote:

>
>
> Alex wrote in Navlist 858
>
> | 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?
>
> =====================
>
> I had also addressed the same matter, in Navlist 798, but Alex does
> not mention that message. Did he receive, and read it?
>
> George.
>
> contact George Huxtable at george@huxtable.u-net.com
> or at +44 1865 820222 (from UK, 01865 820222)
> or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
>
>
> >


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