KEUFFEL & ESSER, Hoboken, NewJersey / USA    SN = 738795          (1941)
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                                                             VERSION (A)

S C A L E S   of  the    » LOG LOG DUPLEX DECITRIG «        Model 4081-3
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Front Side                   [ inverse / RED ]                 Back Side
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L      lgX           [LL0]   [exp(-0.001X) .. exp(-0.01X) .. exp(-0.1X)]
LL1    exp(0.01X)    [LL00]  [exp(-0.1X) .. exp(-1X) .. exp(-10X)]
DF     πX            A       X2 
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CF     πX            B       X2
[CIF]  [1/πX]        T       tan(0.1X) ; [cot(0.1X)]
[CI]   [1/X]         ST      arc(0.01X)
C      X             S       sin(0.1X) ; [cos(0.1X)]
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D      X             D       X 
LL3    exp(X)        [DI]    [1/X]
LL2    exp(0.1X)     K       X3

REMARKS:
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[LL0] & [LL00] are keyed to A ( !!! ) ;    LL1, LL2 & LL3 are keyed to D

There are 2 different Versions  » 4081-3 «  in the Collection:

Older Version (A)
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This model is made of mahogany with scales on celluloid veneer.
The sturdy cardboard case is covered with black artificial leather
but the lid is made of real leather.

Newer Version (B)
It has the same scales as the Models
   4081-5 (50cm)  and the "newer"
   4181-1 (Pocket)  Slide Rule in this collection.

                        Historical Remarks ...
impressum:
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© C.HAMANN         http://public.BHT-Berlin.de/hamann           10/10/08