HEMMI SEISAKUSHO CO. Ltd., Tokyo / Japan            (1951)
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SCALES of the  HEMMI MINI-POCKET  Bamboo-Based  »Mannheim«
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Front Side          [ inverse / RED ]            Back Side
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( 0  ...   10 cm 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

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 A/B ;  T keyed to C/D

This MINI was NOT A TOY!  It came in a nice leather case.
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  Jan. = "A" ...  This slide
rule has the code "BF", means it is made in June 1951.

                  Historical Remarks ...
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann   10/23/07