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FABER-CASTELL   ELEKTRO   ( 25 cm Scales )
Have a look at an Older Version ...



Have a look at NEWER VERSIONS ...

A.W.Faber-Castell, Stein bei Nuernberg / Germany          (1940)
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                                                     VERSION (B)

S C A L E S  of  the  FABER-CASTELL  » ELEKTRO «  Model 1/98/398
================================================================
Front Side      INSIDE      [ inverse / RED ]          Back Side
================================================================
( 0 ...  27 cm Ruler )

LL2    exp(0.1X)
A      X2
----------------------------------------------------------------
B      X2         Scale-i1            S   sin(0.01X); sin(0.1X);
                                         [cos(0.01X); cos(0.1X)]
[CI]   [1/X]                          L   lgX
C      X         [Scale-i2]           T   tan(0.1X)
----------------------------------------------------------------
D      X
LL3    exp(X)
----------------------------------------------------------------
K      X3

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

S keyed to A/B ;  T keyed to C/D

There are 2 scales INSIDE of the body for calculating ...
   Scale-i1  =  "Degree of EFFECTIVENESS" for DYNAMOs & MOTORs
   Scale-i2  =  "VOLTAGE DROP on Copper Wires"

There are 2 VERSIONS of the MODEL 1/98/398 in the Collection:

This Newer Version (B)   Model 1/98/398
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     Production Code = 40_2 = Feb. 1940

Both historic pear wood models came in a black cardboard case.
They have electro-physical data on its back side in German.

The Older Version (A)    Model 1/98/398
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     Production Code = 38_6 = June 1938

Came with an OLDER CURSOR:

    

The INSTRUCTION MANUAL (48 pages) can be downloaded from

   http://www.sliderulemuseum.com/SR_Library_Europe.htm

There are   M O R E   V E R S I O N S   in the collection ...

   Older Version             Model 378
   Production Code =  0_1  = Jan. 1920

   Newer Versions  Models 1/98m & 1/98
   Production Code = 49_6  = June 1949
   Production Code = 53_10 = Oct. 1953


   Newer Version          Model 111/98
   Production Code =  561  =  May 1961

There is a CONTRADICTION in the MOT-VOLT-Scales ...

   F.C.378 vs. F.C.1/98/398
                                ... Hwo knows more about this ???

                    Historical Remarks ...
impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   08/09/10