GRAPHOPLEX, Paris / France                                 (1965)
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S C A L E S   of   the    GRAPHOPLEX   » R I E T Z «    Model 620
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Front Side            [ inverse / RED ]                 Back Side
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                                           ( 0 ...  27 cm Ruler )
(K)    B3     X3
(A)    B2     X2
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(B)    b2     X2                              S         sin(0.1X)
[CI]   a      [1/X]                         S&T        arc(0.01X)
(C)    b      X                               T         tan(0.1X)
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(D)    B      X
(L)    L      lgX

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

This attractive plastic SR has a table with  physical constants &
conversions on its back.  It came in a  dark-red  cardboard case. 
The scale names printed on the SR are  unusual - the common scale
names are given in brackets left beside.

                     Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann       07/11/11