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 |