NoName / Germany                                      (1960)
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S C A L E S   of  the        » R I E T Z «        Model R151
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Front Side                                         Back Side
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( 0 ... 25 cm Ruler )

A        X2
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B        X2                                S       sin(0.1X)
CI       1/X                               L       lgX
C        X                                 T       tan(0.1X)
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D        X
K        X3

( 10 ... 0 " Ruler )

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

To use the Back-Scales, the slider has to be turned.

This NoName is a nice plastic model. It came in a green soft
case together with an instruction sheet.  It is also useful
as a  cm / inch  RULER ...

                  Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    09/10/09