Albert Nestler, Lahr in Baden / Germany              (1960)
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SCALES  of the  NESTLER   P O C K E T  DARMSTADT  Model 11D
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Front Side       [ inverse / RED ]                Back Side
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( 0 ...  13 cm Ruler )

[P]      [sqrt(1 - (0.1X)2)]
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
T        tan(0.1X) ; [cot(0.1X)]
S        sin(0.1X) ; [cos(0.1X)]

REMARKS:
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This pocket slide rule came in a brown leather case.  The
glass cursor has 3 HAIRLINES:  The UPPER-LEFT & CENTER are
in the "Area/Diameter-Relation"  -  The UPPER-LEFT & -RIGHT
are in the distance "185"   =???=   1 Naut.Mile = 1.8520 km
(because CENTER & UPPER-RIGHT are not in "KW/PS-Relation"!)

Picture-Example:  3.14 [Miles] * 1.85 [km/Mile] = 5.81 [km] 

                   Historical Remarks ...
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann    05/21/10