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FABER-CASTELL   POCKET-DISPONENT   67/22R
( 12.5 cm Scales )
with a build-in ADDIATOR on its back side





A.W.Faber-Castell, Stein bei Nuernberg / Germany               (1959)
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SCALES  of the  FABER-CASTELL  P O C K E T - DISPONENT   Model 67/22R
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Front Side        Scales in [RED] & {GREEN}            one sided only
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( 0 ... 14 cm Ruler )

DF       3.6*X     KZ:   K = Start-Kapital,  Z = Zinsen
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[CF]     [3.6*X]         T = Tage
{CI}     {1/X}          p% = Prozentsatz
[C]      [X]             T = Tage
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D        X               Z = Zinsen
Shilling (sh/d) &
Pound (£) - Conversion Scales

R E M A R K S :                    Production Code = 459 = April 1959
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This  »DISPONENT« (=Merchant)  Slide Rule is made of plastic with a
build-in  ADDIATOR  on its back side.

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

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 )

The slide rule came in a green leather case.  Inside is space for the
STYLUS to operate the ADDIATOR.  On its upper end is an example for
valuta calculation and on its lower end is an example for calculating
retail prices.  This ADDIATOR is able to show true negative results.

                   Historical Remarks ...
impressum:
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© C.HAMANN     http://public.beuth-hochschule.de/~hamann     09/30/09