PICKETT & ECKEL, Chicago, Illinois / USA                  (1945)
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SCALES  of the  »  P O C K E T  ALL METAL LOG LOG «    Model 600
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Front Side                                             Back Side
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LL1     exp(+0.01X .. +0.1X);      LL2         exp(+0.1X .. +X);
         exp(-0.01X .. -0.1X)                   exp(-0.1X .. -X)
A                          X2      DF                         πX
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B                          X2      CF                         πX
ST                 arc(0.01X)      CIF                      1/πX
T           tan(X); tan(0.1X)      L                         lgX
S        sin(0.1X); cos(0.1X)      CI                        1/X
C                           X      C                           X
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D                           X      D                           X
DI                        1/X      LL3          exp(+X .. +10X);
K                          X3                    exp(-X .. -10X)

REMARKS:
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This Pocket SR has the same scale configuration as the  N800-ES.
It came in a brown leather case with a clip for the vest pocket.

The term "synchro scale" stands for the combined LogLog scales:
They are designed as a uniquely, split long scale, and, because
LL+/- are reciprocal, 2. & .5 (eg.) share the same tick.

The follower POCKET,  N600-ES, is famous for historical reasons:
It accompanied the astronauts on board of 5 Apollo moon flights.

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann       08/07/11