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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