ARISTO-Werke Dennert & Pape, Hamburg / Germany       (1971)
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S C A L E S  of the  ARISTO  POCKET   R I E T Z   Model 890
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Front Side         [ inverse / RED ]              Back Side
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( 0 ...  14 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

R E M A R K S :                  (  1° = 60' ;   1' = 60" )
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The TRIGONOMETRIC SCALES  are divided in  MINUTES & SECONDS

To use the  Trigonometric Scales,  the slider  has to be
turned and adjusted to  [ sin(90°) = 1 ;  tan(45°) = 1 ]

Production Code = 3LR3 = Geretsried, 1971, Lot 3

Historical Remarks ...

Ref. to the print on the back side, it was an aid tool from
   » TECHN. LEHRINSTITUT DR.-ING.CHRISTIANI - KONSTANZ «

impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann    11/23/07