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POST / HEMMI   »MINI-POCKET«    ( 4" / 10 cm Scales )



FREDERICK POST CO., Chicago, Illinois / USA         (1969)
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                                    made by  HEMMI / Japan

SCALES  of the  POST MINI-POCKET  Bamboo-Based  Model 1441
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Front Side         [ inverse / RED ]             Back Side
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( 0 ...  4" 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 "TF", means it is made in June 1969.

                   Historical Remarks to POST ...
                   Historical Remarks to HEMMI ...
impressum:
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http://public.beuth-hochschule.de/~hamann         06/23/07