Albert Nestler, Lahr in Baden / Germany                        (1960)
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S C A L E S   of  the   N E S T L E R    »  0 1 4 0  «    P O C K E T  
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[ inverse / RED ]                                      one-sided only
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( 0 ...  13 cm Ruler )

   DF     KZ   3.6*X        K = Start-Kapital,  Z = Zinsen
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   CF     T    3.6*X                            T = Tage
   [CI]   %    [1/X]                            % = Percent
   C      T    X                                T = Tage
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   D      Z    X                                Z = Zinsen

REMARKS:
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This "Kaufmann" ( = Merchant )  Slide Rule has DF/CF-Scales
folded at  3.6 * X  for Days-of-the-Year ( and NOT at π  !! ).

  Zinsen (in % ) = Z = ( K * p * n )/100 ;   n = Jahre = Tage/360

( Z = Interest; K = Capital; p = Interest Rate; n = Years; T = Days )

The Cursor has 2 Hairlines  ( left = RED ) & ( BLACK = right )  with
the Distance  1.2  to calculate ...

  ref.  C/D   &  CF/DF  ( = factor 12 )  for Month-of-the-Year
  ref.  C/CF  &  DF/D   ( = factor 30 )  for Days-of-the-Month

                       Historical Remarks ...
impressum:
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© C.HAMANN        http://public.BHT-Berlin.de/hamann         08/27/07