Albert Nestler, Lahr in Baden / Germany                  (1920)
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S C A L E S   of  the   N E S T L E R     » RIETZ «     Model 9
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Front Side                                            Back Side
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K        X3
A        X2
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B        X2                                S         sin(0.1X)
                                           ST        arc(0.01X)
C        X                                 T         tan(0.1X)
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D        X
L        lgX

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

This historic wooden  » Model 9 «  has no reciprocal scale and
the back side is empty  -  Except  that the  former owner  has
"brand-marked" his artful personal logo  »AW«  also there.  The
box has the label of  » Spitta & Leutz Berlin «  -  This was my
loved engineer's drawings supply shop across the TU-BERLIN.

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann      09/22/10