KEUFFEL & ESSER, New York / USA       SN = 725138     (1938)
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S C A L E S  of  the   K & E   » POLYPHASE «   Model N4053-3
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Front Side         [ inverse / RED ]               Back Side
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( 0 ...  10" Ruler )
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A       X2
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B       X2                     S       sin(0.1X); sin(0.01X)
[CI]    [1/X]                  L       lgX
C       X                      T       tan(0.1X)
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D       X
K       X3
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( 0 ...  25 cm Ruler )

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

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

This slide rule is made of mahogany with scales on celluloid
veneer.  Its back side has conversion tables and constants -
given as fractions. Screws on the back side allow adjustment
of the sliding friction.  It came in a brown leather case.

                    Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    12/13/08