A.W.Faber-Castell, Stein bei Nuernberg / Germany (1959) ********************************************************************* SCALES of the FABER-CASTELL P O C K E T - DISPONENT Model 67/22R ===================================================================== Front Side Scales in [RED] & {GREEN} one sided only ===================================================================== ( 0 ... 14 cm Ruler ) DF 3.6*X KZ: K = Start-Kapital, Z = Zinsen --------------------------------------------------------------------- [CF] [3.6*X] T = Tage {CI} {1/X} p% = Prozentsatz [C] [X] T = Tage --------------------------------------------------------------------- D X Z = Zinsen Shilling (sh/d) & Pound (£) - Conversion Scales R E M A R K S : Production Code = 459 = April 1959 ===================================================================== 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: ********************************************************************* © C.HAMANN http://public.BHT-Berlin.de/hamann 09/30/09 |