A.W.Faber-Castell, Stein bei Nuernberg / Germany               (1940)
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SCALES  of  the   FABER-CASTELL   » SCHUL-DISPONENT «    Model 51/22
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Front Side      Scales in [RED] & {GREEN}                   Back Side
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     ... M A R K S  for non-metric conversions ...
(DF)     3.6*X     KZ:     K = Start-Kapital,  Z = Zinsen
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[CF]     [3.6*X]           T = Tage               (LL1)    exp(0.01X)
                                                  (LL2)    exp(0.1X)
{CI}     {1/X}     Val.;  p% = Prozentsatz           p% = Prozentsatz
[C]      [X]       E ;     T = Tage               (C)      X
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(D)      X         V ;     Z = Zinsen
(L)      lgX

R E M A R K S :  There are more  F.-C. »DISPONENTs« in the Collection
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To use the LL-Scales from the back side, the slider has to be turned.

Old Version             Model 51/22
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Production Code = 40_12 = Dec. 1940

This »SCHUL-DISPONENT« (= School-Merchant) SR is made of pearwood w.
scales on celluloid veneer. Its back side is blank.

The (DF),[CF]-Scales are folded at  3.6 * X  for Days-of-the-Year.

Here the (German-) named scales are marked with their common symbols
in brackets: (DF),[CF],{CI},[C],(D),(L).  The formula & translation:

  Zinsen (in % ) = Z = ( K * p * n )/100 ;   n = Jahre = Tage/360

( Z = Interest; K = Capital; p = Interest Rate; n = Years; T = Days )

  E = Einkaufspreis ( = Wholesale Price )
  V = Verkaufspreis ( = Retail Price )       Val. = Valuta = Currency

Have a look at a  » DISPONENT «  with an ADDIATOR on its back side ...

                       Historical Remarks ...
impressum:
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© C.HAMANN        http://public.BHT-Berlin.de/hamann          12/02/13