HEMMI SLIDE RULE CO. LTD., Tokyo / Japan                 (1920)
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S C A L E S  of  the  Bamboo - Based    H E M M I   » Model-1 «
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Front Side                                            Back Side
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( 0 ...  27 cm Ruler )

A     X2
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B     X2                            S     sin(0.01X); sin(0.1X)
                                    L     lgX
C     X                             T     tan(0.1X)
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D     X
                                         ( 0 ...  28 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 A/B ;  T keyed to C/D

This SR came w. French Conversion-Tables on its back side,  and
in a black cardboard case with French Text on top.  The  CURSOR
has one hairline and is unusual shaped - but easy to clean.

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann      03/10/14