GEBR. WICHMANN, Berlin / Germany                          (1925)
****************************************************************
made by Albert Nestler, Lahr in Baden / Germany

SCALES   of  the   W I C H M A N N    » R I E T Z «    Model 474
================================================================
Front Side             [ inverse / RED ]               Back Side
================================================================
( 0 ...  28 cm Ruler )

A        X2
----------------------------------------------------------------
B        X2                          S     sin(0.01X); sin(0.1X)
[CI]     [1/X]                       L     lgX
C        X                           T     tan(0.1X)
----------------------------------------------------------------
D        X

( 0 ...  29 cm Ruler )

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

S keyed to A/B ;  T keyed to C/D

The  slide rule  is made of pear wood  with scales  on celluloid
veneer.  On the back side are  physical  &  technical constants.
In the body under the slider is a 30 ... 55 cm ruler and a print
» A.N.A.G. « ,   an indicator for  made by  » A.NESTLER AG «  - 
The blind print  » 25 «  on the side gives the production year ?

                    Historical Remarks ...
impressum:
****************************************************************
© C.HAMANN     http://public.BHT-Berlin.de/hamann       06/13/10