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HEMMI   POCKET   ( 12.5 cm Scales )



HEMMI SEISAKUSHO CO. Ltd., Tokyo / Japan                      (1949)
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S C A L E S   of the Bamboo-Based   H E M M I  POCKET  Model  »2634«
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Front Side          [ inverse / RED ]                      Back Side
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( 0  ...   14 cm Ruler )

K          X3
DF         X * sqrt(10)
--------------------------------------------------------------------
CF         X * sqrt(10)                           T2       tan(X)
                                                  T1       tan(0.1X)
[CI]       [1/X]                                  L        lgX
C          X                                      S        sin(X)
--------------------------------------------------------------------
D          X
A          X2

REMARKS:
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ATTN:  The CF / DF scales are folded at  sqrt(10)   < and NOT at π >

This nice slide rule came in a brown leather case.  To make it more
useful, a self-made INCH SCALE and a FRACTION-TO-DECIMAL CONVERSION
TABLE is glued on the former empty back sides.  The bamboo sides are
held together with a metal sheet.

The »2600« series of HEMMI's slide rules, introduced in 1940, is
named in memoriam of 2600 years after the founding of Japan. This
»2634« model is the pocket version of their »2664« model.

                   Historical Remarks ...
impressum:
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© C.HAMANN    http://public.beuth-hochschule.de/~hamann     10/23/07