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NESTLER - RIETZ   Model  23   ( 25 cm Scales )



Albert Nestler, Lahr in Baden / Germany                     (1925)
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S C A L E S   of  the   N E S T L E R      » RIETZ «      Model 23
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Front Side                                               Back Side
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( 0 ...  25 cm Ruler )

   K        X3
   A        X2
------------------------------------------------------------------
   B        X2                      S     sin(0.01X); sin(0.1X)
   C        X                       T     tan(0.1X)
------------------------------------------------------------------
   D        X
   L        lgX

( 1:25  Ruler )

R E M A R K S :                         (  1° = 60' ;   1' = 60" )
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The TRIGONOMETRIC SCALES  are divided  in  MINUTES(') & SECONDS(")

S keyed to A/B ;  T keyed to C/D

On the back side  is a ( worn-out ) table  with physical constants.
In the INNER BODY of this historic mahogany RIETZ SR are 2 PATENT-
NUMBERS engraved 173660 (=Nestler,1905) & 181110 (= M.Rietz,1902),
and NO MODEL NUMBER ! But the SR came in a cardboard case with the
INSCRIPTION  » No.23  Nestler's  System Rietz  D.R.P.  No.173660 «

The CURSOR GLASS was broken.  It had to be replaced by a HOME-MADE
of  PVC from a  CD-Cover  -  The  HAIRLINE  is made  with a  sharp
»X-ACTO«  and colored  with a  permanent marker.  "MouseOver"  the
cursor in the picture above to get a DETAILED VIEW of it ...

Historical Remarks ...

impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann    06/20/11