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FABER-CASTELL   » POCKET-RIETZ «
( 12.5 cm Scales )



A.W.Faber-Castell, Stein bei Nuernberg / Germany         (1938)
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                              Production Code = 5_38 = May 1938

SCALES  of the  F.-C.  » P O C K E T - R I E T Z «  Model 63/87
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Front Side              [ inverse / RED ]             Back Side
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( 0 ...  14 cm Ruler )

   A      X2
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   B      X2                    S     sin(0.01X); sin(0.1X)
   [CI]   [1/X]                 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  POCKET-SR  is made of  PEAR WOOD  with  SCALES & BASE  of
celluloid veneer. It has a 3-Line-Cursor and it came in a brown
leather case.
                   Historical Remarks ...
impressum:
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© C.HAMANN  http://public.beuth-hochschule.de/~hamann  05/01/12