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REISS   RIETZ - SPEZIAL   ( 25 cm Scales )



REISS, Bad Liebenwerda / (GDR) Germany                     (1970)
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                                                      VERSION (A)

SCALES of the REISS LIGHT METAL  » RIETZ - SPEZIAL «   Model 3201
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Front Side              [ inverse / RED ]               Back Side
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L          lgX                       ST       arc(0.1X)
DF         πX                        T        tan(0.1X)
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CF         πX                        K        X3
[CIF]      [1/πX]                    B        X2
C          X                         C        X
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D          X                         S        sin(0.1X)
[DI]       [1/X]                     [P]      [sqrt(1 - (0.1X)2)]

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

This beautiful aluminum model came with a "MANTISSA-Type" cursor.

There is a Newer (1975) Version (B) in the Collection
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The NAME is changed to »Rietz-Spezial-360« and the BODY-ENDS are
made different. Instead of glued blocks under the scales, now the
scales are embedded in metal ends and fixed with four metal pins:


                  Historical Remarks ...
impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   03/30/09