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FABER-CASTELL   » MINI-POCKET «
( 10 cm Scales )



A.W.Faber-Castell, Stein bei Nuernberg / Germany   (1941)
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S C A L E S  of the   F.-C.  » MINI-POCKET «  Model 74/91
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Front Side                                      Back Side
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( 0 ...  10 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

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-POCKET  SR is made of pear wood with scales on
celluloid veneer.  It came in a leather case - and it was
NOT A TOY!  Ref. to the print on the nice cover, it was a
gift from the famous German  »SKF«  ball-bearing company.

Historical Remarks ...

Because the original cursor was missing, there is a home-
made of plastic. The hairline is made with a »X-ACTO« and
colored with a marker - and for "contrast" the edges too.

    

                       Production Code = 41_6 = June 1941
impressum:
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http://public.beuth-hochschule.de/~hamann        10/28/08