+-------------------------------------------------------------+
|                    !!!  T H A N K S  !!!                    |
|     This Slide Rule came as a DONATION of IWA / H.RIEHLE    |
|     to the  » ON-LINE MUSEUM « / BEUTH HOCHSCHULE BERLIN    |
+-------------------------------------------------------------+

DE MUIDERKRING, Bussum / Nederland                       (1963)
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made by  IWA / F.RIEHLE, Esslingen / Germany 

S C A L E S   of  the    » I W A - T R O N I C «     Model 0272
===============================================================

Front Side
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      Wavelenght  λ   =  300 km       ..  0.3 m
(1)               ω   =  6E3 /sec     ..  6E9 /sec
      Frequency   f   =  1 kHz        ..  1 GHz 
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(2)   Capacity    C   =  1 pF         ..  100 μF     (U-SLIDER)
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(3)   Indctivity  L   =  10 H         ..  1 μH
(4)   Resistance  CR  =  100 MΩ       ..  100 Ω
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(5)            L ; C  =  1 mH ; 1 pF  ..  1kH ; 1 μF (D-SLIDER)
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(6)   Resistance  LR  =  10 Ω         ..  10 MΩ

                                                      Back Side
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(7)   X3
(8)   sin(0.1X); cos(0.1X) = 6° ; 84° ..  90° ; 0°
(9)   tan(0.1X); cot(0.1X) = 6° ; 84° ..  45° ; 45°
(10)  X2 ;  P1/P2
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      X2
(11)  1/X                                              (SLIDER)
(12)  X
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      X ;  U1/U2 ;  I1/I2
(13)  Ln(X) ; Neper
(14)  cm ; dB

R E M A R K S :
===============================================================
The SR came in a grey soft-plastic case with an instruction.

   Neper   [ N ]   =     ln( U1 / U2 )
   Dezibel [ dB ]  =  10*lg( P1 / P2 )
                   =  10 * lg{ ( U12/R1 ) / ( U22/R2 ) }
                   =  10 * lg{ ( U1 / U2 )2 * R2/R1 }
                   =  20 * lg| U1 / U2 |  with  R1 = R2

     spec.:   0 dB = 1 mW  on  600 Ω  =  0.775 V

     ===>>     1 N = 8.686 dB
              1 dB = 0.1151 N

Have a look at an Older Version ...

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann      05/20/10