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FABER-CASTELL   » DISPONENT «   1/22 A
( 25 cm Scales )
with a build-in ADDIATOR on its back side






A.W.Faber-Castell, Stein bei Nuernberg / Germany               (1939)
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S C A L E S   of  the  FABER-CASTELL    » DISPONENT «    Model 1/22 A
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Front Side      Scales in [RED] & {GREEN}                   Back Side
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( 0 ...  27 cm Ruler )

     ... M A R K S  for non-metric conversions ...
(DF)     3.6*X     KZ:     K = Start-Kapital,  Z = Zinsen
---------------------------------------------------------------------
[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
---------------------------------------------------------------------
(D)      X         V ;     Z = Zinsen
(L)      lgX
---------------------------------------------------------------------
Shilling (s/£) Pound    &    Penny (d/£) Pound      Conversion Scales

R E M A R K S :
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In the left side is a stylus placed for using the build-in  ADDIATOR
on the back side. The handle on the right side resets the ADDIATOR to
zero. "MouseOver" the ADDIATOR in the picture below to get a detailed
view of it: This version shows  t r u e  negative results!

To use the LL-Scales from the back side, the slider has to be turned.

This »DISPONENT« (=Merchant) Slide Rule is made of pearwood with
scales on celluloid veneer. On its back side are conversion tables.
Production Code = 39_3 = March 1939

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

Historical Remarks ...

Unfortunately this  »FC-1/22A«  was found in a flea-market without
cursor and without case cap - both must be home-made. "MouseOver" the
CURSOR in the picture above to get a DETAILED VIEW of it.

To get a detailed view of the slide rule scales, refer to  »FC-1/22«
in this collection and "MouseOver" its cursor there ...

impressum:
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© C.HAMANN     http://public.beuth-hochschule.de/~hamann     02/03/08