Albert Nestler, Lahr in Baden / Germany              (1920)
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                                                VERSION (A)

SCALES of the NESTLER POCKET (Siemens-Schuckert)  R I E T Z
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Front Side                                        Back Side
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( 0 ...  12 cm Ruler )

A     X2
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B     X2                        S     sin(0.01X); sin(0.1X)
                                L     lgX
C     X                         T     tan(0.1X)
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D     X

( 0 ... 14 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

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

This old model is made of mahogany with scales on celluloid
veneer.  On the back side of the slide rule is a table with
physical constants.  There is no model number - In the base
is engraved:  »SIEMENS-SCHUCKERT«.  Also the  brown leather
case has the SS-Logo on its back side - It was a gift item!

There is a newer  (1930)  VERSION (B)  in  the  Collection:
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It has now a frameless CURSOR; and it came without its case

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