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FABER-CASTELL   POCKET-RIETZ   67/87Rb
( 12.5 cm Scales )
with a build-in ADDIATOR on its back side





A.W.Faber-Castell, Stein bei Nuernberg / Germany           (1967)
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SCALES  of the  FABER-CASTELL POCKET - R I E T Z    Model 67/87Rb
=================================================================
( 0 ... 14 cm Ruler )   [ inverse / RED ]      ( one-sided only )

   L        lgX
   K        X3
   A        X2
-----------------------------------------------------------------
   B        X2
   [CI]     [1/X]
   C        X
-----------------------------------------------------------------
   D        X
   S        sin(0.1X)
   ST       arc(0.01X)
   T        tan(0.1X)

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

The SR came in a green leather case ( w.zipper ).  The STYLUS, to
operate the build-in ADDIATOR on its back side,  was missing  and
had to be  HOME-MADE.  This  ADDIATOR  is able  to show   t r u e
negative results  in its lower window.  On the  upper end  of the
ADDIATOR are mathematical constants and formulas and on its lower
end are US/Metric conversions printed.

Historical Remarks ...

Ref. to the print on the case, this Pocket Slide Rule  was a gift
from  »BRAAS«,  a well known company for making roof tiles.

impressum:                     Production Code = 11_67 = Nov.1967
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   06/13/11