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FABER-CASTELL » DISPONENT « 1/22 A
( 25 cm Scales )
with a build-in ADDIATOR on its back side
A.W.Faber-Castell, Stein bei Nuernberg / Germany (1939)
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S C A L E S of the FABER-CASTELL » DISPONENT « Model 1/22 A
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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
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[CF] [3.6*X] T = Tage (LL1) exp(0.01X)
{CI} {1/X} Val.; p% = Percent (LL2) exp(0.1X)
[C] [X] E ; T = Tage (C) X
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(D) X V ; Z = Zinsen
(L) lgX
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Shilling (s/£) Pound & Penny (d/£) Pound Conversion Scales
R E M A R K S :
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In the left side is a stylus placed for using the build-in ADDIATOR
on the back side. The handle on the right side resets the ADDIATOR to
zero. "MouseOver" the ADDIATOR in the picture below to get a detailed
view of it: This version shows t r u e negative results!
To use the LL-Scales from the back side, the slider has to be turned.
This »DISPONENT« (=Merchant) Slide Rule is made of pearwood with
scales on celluloid veneer. On its back side are conversion tables.
Production Code = 3_39 = March 1939
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
Historical Remarks ...
Unfortunately this »FC-1/22A« was found in a flea-market without
cursor and without case cap - both must be home-made. "MouseOver" the
CURSOR in the picture above to get a DETAILED VIEW of it.
The Older Model 1/22 in this collection shows the ORIGINAL CURSOR:
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To get a detailed view of the slide rule scales, refer to