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FABER-CASTELL   » DISPONENT «   1/22 & 11/22
( 25 cm Scales )



A.W.Faber-Castell, Stein bei Nuernberg / Germany               (1951)
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                                                          VERSION (B)

S C A L E S   of  the  FABER-CASTELL   » DISPONENT «    Model 1/22 HL
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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 :              There are 2 Model 1/22 in the Collection
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To use the LL-Scales from the back side, the slider has to be turned.

Newer Version (B)     Model 1/22 HL
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Production Code = 51_10 = Oct. 1951

This »DISPONENT« (=Merchant) Slide Rule is made of pearwood with
scales on celluloid veneer and it came with a magnifying cursor.
On the BACK SIDE are conversion tables and how to calculate interest.

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


The Older Version (A)  Model 1/22  has the same scales,
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but an interesting CURSOR (easy to clean every corner!)

Production Code = 41_8 = Aug. 1941

   

Model 11/22  has the same scales,
---------------------------------
but another CURSOR

Production Code = 46_6 = Juni 1946

   

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.beuth-hochschule.de/~hamann     01/11/10