A.W.Faber-Castell, Stein bei Nuernberg / Germany     (1946)
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S C A L E S  of the  FABER-CASTELL  » RIETZ «   Model 11/87
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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)]
[CI]     [1/X]               ST     arc(0.01X)
C        X                   T      tan(0.1X) ; [cot(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 has on its back side a sheet
with physical data.  It came in a black cardboard case.

The body of this 11/87 is thinner than the 1/87 series.
In the body under the slider is a 33 ... 60 cm ruler.

Historical Remarks ...
                         Production Code = 46_6 = June 1946
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann    12/26/06