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FABER-CASTELL   RIETZ   ( 25 cm Scales )





A.W.Faber-Castell, Stein bei Nuernberg / Germany      (1939)
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SCALES  of the  FABER-CASTELL   » RIETZ «     Model 1/75/375
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Front Side           [ inverse / RED ]             Back Side
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( 0 ...  27 cm Ruler )

K        X3
A        X2
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B        X2                   S      sin(0.1X) ; [cos(0.1X)]
                              ST     arc(0.01X)
C        X                    T      tan(0.1X)
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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

This historic wooden » Model 1/75 « has no reciprocal scale.
In the body under the slider is a 33 ... 60 cm ruler. On its
back is a table with physical constants.  It came in a black
cardboard case.  Case and slide rule body have prints:

» No.25  Feinmessinstitut JOE KLAWUN BERLIN-CHARLOTTENBURG «

                          Production Code = 39_8 = Aug. 1939

               Historical Remarks ...
impressum:
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http://public.beuth-hochschule.de/~hamann           12/27/06