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FABER-CASTELL   RIETZ   ( 25 cm Scales )




A.W.Faber-Castell, Stein bei Nuernberg / Germany      (1941)
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                                                 VERSION (A)

S C A L E S  of  the  FABER-CASTELL   » RIETZ «   Model 1/87
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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

There are 3 Versions in the Collection:
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VERSION (A)  Production Code = 41_11 = Nov. 1941

In the body under the slider is a 33 ... 60 cm ruler.
This historic wooden model has on its back side a sheet
with physical data.  It came in a black cardboard case.

VERSION (B)  Production Code =  8 63 = Aug. 1963
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The BODY-HIGHT is smaller, the CURSOR has changed, NAMES of
Scales ( K .. L / X3 .. lgX ) & LOGO "CASTELL" are printed.
On the back side is an extended sheet with physical data.
It came in an UNUSUAL plastic/acrylic (side-loadable) CASE.

Have a look at the  USA VERSION (C)  in this collection ...

                Historical Remarks ...
impressum:
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http://public.beuth-hochschule.de/~hamann           06/12/10