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
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