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Brad,

> Bei d nahe 0 oder t nahe 0 und 90  verwende F-Tafel

translates to 

"With dec close to 0� or LHA close to 0� and 90� use 
F-Tables" 

(nomenclature adapted)

F-Tables being the alternative German sight reduction 
method in these days.

Best
Wolfgang



Am Mittwoch, 30. Januar 2013 15:21 schrieb Brad Morris:
> Hi Gary
>
> Image 122161.img_2160.jpg tells the tale!
>
> In it, we see the rules for using the device. 
> Within those rules, we see the standard
> admonishments for the MHR1, with one major and
> glaring change.  In German, we have:
>
> Bei d nahe 0 oder t nahe 0 und 90  verwende F-Tafel
>
> Which I loosely translate to:
>
> Do not use the slide rule (F-Tafel) when declination
> is near zero deg or when the hour angle is near 0 or
> 90 deg.
>
> The is no longer any numerical prohibition like 0
> deg 20 min or 89 deg 40 min.  It just says "near"
> (nahe).  This could be understood to say the same
> thing, since 20 min is near to zero.
>
> But given the precise directions of the MHR1, I
> would like to think that near now means that the
> scale has been extended downwards and upwards, as we
> have discussed, towards 0 and 90 deg.  To what
> value?  The images do not reveal this data point. 
> Pity.  I'd like to think that it went to within an
> arc minute, the trick of a tiny offset to include 0
> deg 90 deg not withstanding.
>
> What do you make of the conversion table, the
> adjustment knobs and the magnifying glass? 
> Magnifiers are typically associated with verniers
> and fine graduations.
>
> Regards
> Brad
>
> On Jan 30, 2013 12:39 AM, "Gary LaPook" 
 wrote:
> > ------------------------------
> >
> > I am attaching some photos I took of the MHR2 in
> > London in 2009.
> >
> > gl
> >
> > +++++++++
> >
> > I would be very curious to see what the scale
> > lengths and operating ranges of the MHR2 table top
> > calculator. Ronald - Do you know these values?
> >
> > ++++++
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> >
> > Linked File:
> > http://www.fer3.com/arc/imgx/f1-IMG_2170.JPG
> >
> > *Attached File:
> > 122161.img_2160.jpg >.img_2160.jpg> *
> > *Attached File:
> > 122161.img_2161.jpg >.img_2161.jpg> *
> > *Attached File:
> > 122161.img_2162.jpg >.img_2162.jpg> *
> > *Attached File:
> > 122161.img_2164.jpg >.img_2164.jpg> *
> > *Attached File:
> > 122161.img_2166.jpg >.img_2166.jpg> *
> > *Attached File:
> > 122161.img_2167.jpg >.img_2167.jpg> *
> > *Attached File:
> > 122161.img_2168.jpg >.img_2168.jpg> *
> > *Attached File:
> > 122161.img_2169.jpg >.img_2169.jpg> *
> >
> > :
> > http://fer3.com/arc/m2.aspx?i=122161
>
> :
> http://fer3.com/arc/m2.aspx?i=122166

   

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