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WICHMANN - DARMSTADT   » 4477 «
( 25 cm Scales )



GEBR. WICHMANN, Berlin / Germany                     (1940)
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made by Albert Nestler, Lahr in Baden / Germany as Model 21

SCALES of the  W I C H M A N N   » DARMSTADT «   Model 4477
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Front Side       [ inverse / RED ]                Back Side
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( 0 ...  27 cm Ruler )

L        lgX
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K        X3
A        X2
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B        X2                              LL1     exp(0.01X)
[CI]     [1/X]                           LL2     exp(0.1X)
C        X                               LL3     exp(X)
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D        X
[P]      [sqrt(1 - (0.1X)2)]
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S        sin(0.1X) ; [cos(0.1X)]
T        tan(0.1X) ; [cot(0.1X)]

REMARKS:
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The body, under the slider says  »A.N.A.G.« ,  an indicator
for made by  »A.NESTLER AG«.  The  NESTLER  Model »21«  has
the same scales, but the  »4477«  has screws and an acrylic
cursor.  The slide rule came in a black cardboard case.

                   Historical Remarks ...
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann    08/11/09