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   » AEG «   P O C K E T  
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Front Side         [ inverse / RED ]               Back Side
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( 0 ...  13 cm Ruler )

K            X3
A     (Nb)   X2
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B            X2                         S         sin(0.1X)
[CI]  (Nw)   [1/X]                      ST        arc(0.01X)
C            X                          T         tan(0.1X)
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D            X
cos(&phi)     < 0.995 .. 0.1 >

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

Ref. to the print on the back side, this  » AEG «  Pocket
Slide Rule with its special  » ELEKTRO «  scales  was a
gift from the  » ALLGEMEINE ELEKTRIZITAETSGESELLSCHAFT « 

   Nb = Blind-Leistung       Nw = Wirk-Leistung
      = "Blind" Power           = "Real" Power         where   

  |N| = sqrt( Nw2 * Nb2 ) = |U|*|I|     tan(&phi) = Nb / Nw 

   Nw = |N|* cos(&phi)   with   "Power Factor" = cos(&phi)

                   Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    05/16/07