FREDERICK POST CO., Chicago, Illinois / USA          (1946)
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                                     made by  HEMMI / Japan

S C A L E S   of  the   P O S T   Bamboo-Based   Model 1446
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Front Side                                        Back Side
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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

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

The bamboo sides are held together with a metal sheet.
The slide rule came in a black cardboard case.

HEMMI introduced a year code, starts with  1950 = "A" ... 
and the month code starts with  Jan. = "A" ...  This slide
rule has the code "SI", means it is made in September 1968.

Made 1946 (?), because there is NO YEAR CODE on this SR.

                   Historical Remarks to POST ...
                   Historical Remarks to HEMMI ...
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann    08/11/09