A.W.Faber-Castell, Stein bei Nuernberg / Germany      (1934)
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S C A L E S   of  the  FABER-CASTELL   » RIETZ «   Model 387
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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)
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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.

In the body under the slider is a 33 ... 60 cm ruler.
Sliding friction is adjustable with the screws on the side.

Historical Remarks ...
                         Production Code = 34_11 = Nov. 1934
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    06/23/08