NORMA / Germany                                        (1960)
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SCALES of the NORMA »MERKURIA« CIRCULAR SLIDE RULE  Model 190
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                                           ( one-sided only )
Zins-Divisoren
bei % Zinssatz
X                                               outer circles
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X                                               inner circles
1/X
-  %  +
-  %  +   auf netto / von brutto
US/GB Conversions

REMARKS:
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» Model 190 «  because the  OVER ALL DIAMETER  equals  190 mm
The length of the scale is:  15 cm * π  =  47 cm  =  18 1/2 "

The cursor is restored & enhanced with screwed metal strips.
On the back side of the plastic cover is a SHORT INSTRUCTION,
refering to the "Grosse Gebrauchsanleitung" (= large manual )
of the  » GROSSE NORMA-RECHENSCHEIBE FUER DEN KAUFMANN «

                   Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann     03/03/07