KEUFFEL & ESSER, New York / USA        SN = 121178         (1950)
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S C A L E S   of   the      »  P O C K E T  «        Model 4097_C
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Front Side          [ inverse / RED ]                   Back Side
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                                               ( 0 ... 5" Ruler )
A        X2
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B        X2                           S     sin(0.01X); sin(0.1X)
[CI]     [1/X]                        L     lgX
C        X                            T     tan(0.1X)
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D        X
K        X3                                 ( 0 ... 13 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 B ;   T keyed to C/D

The Celluloid Pocket-SR was a gift of the PACIFIC PUMPS, INC., as
the inscription on the SR and its leather case reads.

                     Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann       05/23/14