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HEMMI   POCKET - RIETZ   ( 15 cm Scales )



HEMMI SEISAKUSHO CO. Ltd., Tokyo / Japan                  (1957)
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S C A L E S  of the Bamboo-Based  HEMMI POCKET-RIETZ  Model »66«
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Front Side          [ inverse / RED ]                  Back Side
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( 0  ...  6"  Ruler )

K           X3
A           X2
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B           X2                                S       sin(X)
[CI]        [1/X]                             ST      arc(0.01X)
C           X                                 T       tan(0.1X)
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D           X
L           lgX

( 0 ... 15 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(")

The slide rule came in black cardboard case.  On the back side
of the slide rule are US/Metric CONVERSION TABLES.  The bamboo
sides are held together with a metal sheet.

HEMMI introduced a year code, starts with  1950 = "A" ... 
and the month code starts with  January = "A" ...
This slide rule has the code "HA", means it is made in Jan. 1957

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