previous <<==>> next

HUGHES-OWENS / HEMMI   » 1771 »
( 10" / 25 cm Scales )



H U G H E S - O W E N S / CANADA                         (1946)
***************************************************************
                                         made by  HEMMI / Japan

S C A L E S  of  the   HUGHES-OWENS   Bamboo-Based   Model 1771
===============================================================
Front Side           [ inverse / RED ]                Back Side
===============================================================
( 0 ...  10" Ruler )

A          X2
---------------------------------------------------------------
B          X2                     S       sin(0.01X); sin(0.1X)
[CI]       [1/X]                  L       lgX
C          X                      T       tan(0.1X)
---------------------------------------------------------------
D          X
K          X3

( 0 ...  27 cm Ruler )

R E M A R K S :                      (  1° = 60' ;   1' = 60" )
===============================================================
The  TRIGONOMETRIC SCALES  are  divided  in  MINUTES  & SECONDS

The SR came in a brown leather case.  It is made of bamboo. The
sides are held together  with a  metal sheet.  Its back side is
empty.  HEMMI started a year code in 1950.  NO CODE  was found!
Behind the "SUN"-Logo is a carved-out 1_1/4"  LINE - May be the
former(?)TEXT "Made in Occupied Japan" upset the Japanese user?
This dates the slide rule:  Made just after WWII in 1946.

   

Historical Remarks to HUGHES-OWENS ...
Historical Remarks to HEMMI ...

impressum:
***************************************************************
© C.HAMANN  http://public.beuth-hochschule.de/~hamann  04/01/11