A.W.Faber, Geroldsgruen / Germany                     (1927)
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S C A L E S   of the  F A B E R     » RIETZ «      Model 375
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Front Side                                         Back Side
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( 0 ...  27 cm Ruler )

K        X3
A        X2
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B        X2                                S      sin(0.1X)
                                           ST     arc(0.01X)
C        X                                 T      tan(0.1X)
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D        X
L        lgX

( 0 ...  29 cm Ruler )

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

This historic wooden » Model 375 « has no reciprocal scale.
On its back side is a table with technical constants.
It came in a black cardboard case.

Historical Remarks ...
                          Production Code = 7_3 = March 1927
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    06/12/10