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REISS - ELEKTRO   ( 25 cm Scales )



REISS, Bad Liebenwerda / (GDR) Germany                     (1975)
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SCALES   of  the   R E I S S   LIGHT  METAL    » E L E K T R O «
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Front Side              [ inverse / RED ]               Back Side
=================================================================

K       X3                       LL2                    exp(0.1X)
A       X2                       Dynamo ( 20 .. 100 .. 20 ) Motor
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B       X2                       S                      sin(0.1X)
[CI]    [1/X]                    ST                    arc(0.01X)
C       X                        T; [T]       tan(0.1X); [tan(X)]
-----------------------------------------------------------------
D       X                                ( 0.5 .. 1 .. 10 )  Volt
L       lgX                      LL3                       exp(X)

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

ATTENTION:    Scale [tan(X)] refers to the reciprocal [CI] scale.

This beautiful aluminum slide rule  came in a brown leather cover
with the "blind print" »MEISSNER«.  Like the  »RIETZ-SPEZIAL-360«
the  BODY-ENDS  are embedded (not glued) in metal ends  and fixed
with four metal pins.

The "CU-MARKERS"  REISS-ELEKTRO  vs.  FABER-CASTELL-ELEKTRO 1/98:
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My friend  Klaus Kraemer  made me aware of an INCONSISTENCY here!
On my own "Research" I found out something curious:

Copy of the FABER-CASTELL 1/98 MANUAL, p.26 ...

 

The FABER-CASTELL-ELEKTRO 1/98 has the SAME SCALES, BUT ...

MARKERS on REISS-ELEKTRO       CU(Ω) = 22   ;    CU(g) = 143  ???
MARKERS on F.-C. 1/98       BLACK-CU = 1782 ;   RED-CU = 1122
   same on F.-C. 111/98  (= Marks on SCALE A )

B U T   on F.-C. 378     (= Marks are ON SCALE  ===>>>  D  !!!)
   same on F.-C. 1/98/398   BLACK-CU = 1482 ;   RED-CU = 3782

When these figures are  SQUARED, RESULTS ARE CLOSE TO REISS'  !!!
Q U E S T I O N :   HAS  FABER-CASTELL  MADE  AN   E R R O R  ???
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R E M A R K :  NESTLER-ELEKTRO_37 Markers ref. to CU-Conductivity 
               on all its scales ( on C/D  &  2x on A/B ) CU = 57

A  look in  T E C H   T A B L E S  ( eg. HUETTE_IV_A, p.808 ) ...
   +---------------------------------------------------------+
   |    Copper Conductivity  CU(Ω) = 57 [ m /( Ω * mm2 )]    |
   |    Copper Spec.Weight   CU(g) = 8.9 [ g/cm3 ]           |
   +---------------------------------------------------------+

                   Historical Remarks ...
impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   11/12/13