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ARISTO POCKET RIETZ ( 12.5 cm Scales )
ARISTO-Werke Dennert & Pape, Hamburg / Germany (1955)
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VERSION (A)
S C A L E S of the ARISTO POCKET R I E T Z Model 89
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Front Side [ inverse / RED ] Back Side
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( 0 ... 13 cm Ruler )
K X3
A X2
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B X2 S sin(0.1X)
[CI] [1/X] ST arc(0.01X)
C X T tan(0.1X)
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D X
L lgX
( 0 ... 5" Ruler )
R E M A R K S : ( 1° = 60' ; 1' = 60" )
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The TRIGONOMETRIC SCALES are divided in MINUTES & SECONDS
Version (A)
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Production Code = G553 = Geretsried, 1955, Lot 3
W A R N I N G : This slide rule came very dirty. In the process
of cleaning ( with mild warm soap water ) parts of the R E D
I N S C R I P T I O N vanished ...
Version (B)
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Production Code = G599 = Geretsried, 1959, Lot 9
The LOGO has changed. Ref. to the print on the back side and on
the brown leather case this Pocket Slide Rule was a gift from the
famous » BORSIG « company in Berlin / Germany.
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Version (C)
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Production Code = GFF23 = Geretsried, 1966, Lot 23
Version (D)
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Production Code = 3LT10 = Geretsried, 1974, Lot 10
Both versions have a ( 0 ... 14 cm RULER ) on front and NO INCH-
RULER on its back side. The LOGOS have changed. They came with
different MAGNIFIYING CURSORS in brown leather cases. Ref. to the
print on the back side: Version (D) was a gift from the famous
» AEG-TELEFUNKEN « company in Berlin / Germany.