DE MUIDERKRING, Bussum / Nederland                       (1960)
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made by  IWA / F.RIEHLE, Esslingen / Germany 

S C A L E S   of  the    I W A      » RADIO «       Model 51904
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Front Side              [ RED ]                       Back Side
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( 0 ...  20 cm Ruler )
                                                      NOMOGRAM:
                                      I2/I1 ;  Decibel ;  P2/P1
A      X2                             U2/U1 ;    db    ;    x
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B      X2                                    S      sin(0.01X);
[ Capacity  =  1 pF .. 10 nF ;                        sin(0.1X)
      Inductivity  =  10 mH .. 0.1 μH ]      L      lgX
C      X                                     T      tan(0.1X)
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D      X
[ Frequency  =  10 kHz  ..  500 MHz ]                  DIAGRAM:
[ Wavelenght =  30 km   ..  0.6 m ]       Resistance Color Code  

( 0 ...  7 7/8" Ruler )

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

S keyed to A/B ;  T keyed to C/D

Have a look at a Newer Version ...

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann      05/17/10