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POST / HEMMI   » 1447 »   ( 10" / 25 cm Scales )



FREDERICK POST CO., Chicago, Illinois / USA          (1968)
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                                     made by  HEMMI / Japan

S C A L E S   of  the   P O S T   Bamboo-Based   Model 1447
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Front Side         [ inverse / RED ]              Back Side
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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
K          X3

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.
On the back are US/Metric CONVERSIONS & TRIGON.RELATIONS.
The slide rule came in a grey hard-cover 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.

                   Historical Remarks to POST ...
                   Historical Remarks to HEMMI ...
impressum:
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http://public.beuth-hochschule.de/~hamann          02/23/07