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FABER-CASTELL   RIETZ   ( 25 cm Scales )



Have a look at the VERSIONS (A & B) in this collection ...

A.W.Faber-Castell, Stein bei Nuernberg / Germany      (1952)
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                                             USA VERSION (C)

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 ...  10" 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

( 0 ...  30 cm 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 is an USA-Version:  The upper
ruler is in INCHES and the upper right CURSOR MARK is "HP".
It came in a green cardboard case. The physical data on its
back side, printed on paper, are mostly deteriorated now.

Historical Remarks ...

                          Production Code = 52_1 = Jan. 1952
impressum:
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http://public.beuth-hochschule.de/~hamann           10/23/07