A.W.Faber-Castell, Stein bei Nuernberg / Germany               (1959)
*********************************************************************

SCALES  of  the  FABER-CASTELL   » STUDENT-DISPONENT «    Model 57/22
=====================================================================
Front Side                                                  Back Side
=====================================================================
( 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                  Z = Zinsen
L      lgX

R E M A R K S :                    Production Code = 6 59 = Juni 1959
=====================================================================
To use the LL-Scales from the back side, the slider has to be turned.

This  » STUDENT-DISPONENT «  ( = Merchant; "Schul-Rechenstab" )  is
made of plastic.  It came in a green cardboard case.

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 )

                        Historical Remarks ...
impressum:
*********************************************************************
© C.HAMANN        http://public.BHT-Berlin.de/hamann         08/22/09