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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
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Front Side INSIDE [ inverse / RED ] Back Side
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( 0 ... 27 cm Ruler )
LL2 exp(0.1X)
A X2
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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)
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D X
LL3 exp(X)
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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
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:
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The INSTRUCTION MANUAL (48 pages) can be downloaded from