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TROEGER  RECHENSCHEIBE
( 11" / 28 cm Diameter )



On the BACK SIDE is the KNOB to turn the inner scale:




K. EMIL TROEGER  Mylau in Voigtland / Germany              (1935)
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S C A L E S   of  the  CIRCULAR  SLIDE  RULE        » TROEGER 2 «
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   D       X                                      outer circle
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   C       X                                      inner circles
   CI      1/X


MODEL  » TROEGER 1 «                           ( 15 cm Diameter )
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Only 2 Scales and NO CURSOR    ===>>>   Is a "PROPORTIONAL SCALE"

     

R E M A R K S :
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Both Circular Slide Rules are made of Cardboard

impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   06/13/11