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FABER-CASTELL ELEKTRO ( 25 cm Scales )
Have a look at OLDER VERSIONS ...
Have a look at a Newer Version ...
A.W.Faber-Castell, Stein bei Nuernberg / Germany (1953)
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S C A L E S of the FABER-CASTELL » ELEKTRO « Model 1/98
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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); [ctg(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"
Model 1/98 Production Code = 53_10 = Okt. 1953
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This Model »1/98« is made of box wood. On its back side is a
table with mathematical & electrical formulas, constants and
instructions. It has a red "Cu"-Mark on A-Scale and the "735"-
Mark is changed ( instead 736 ). On the back side of the slider
also "ctg" is marked red. This SR has an acrylic cursor. It came
in a green cardboard case.
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 ...
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Model 1/98m Production Code = 49_6 = June 1949
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This OLDER MODEL » 1/98m « is made of peach wood and came in a
damaged black cardboard case. Scales are the same but it has the
mark "736" on A-Scale and red & black "Cu"-Marks on D-Scale. The
CURSOR is different. On the back side is a table with math. &
electrical formulas, constants & instructions.