KEUFFEL & ESSER, Hoboken, NewJersey / USA   SN = 253471   (1955)
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                                                     VERSION (B)

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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[LL02]   [exp(-0.1X)]            [LL01]  [exp(-0.01X)]
[LL03]   [exp(-X)]               L       lgX
                                 K       X3 
DF       πX                      A       X2 
----------------------------------------------------------------
CF       πX                      B       X2
[CIF]    [1/πX]                  T       tan(0.1X) ; [cot(0.1X)]
[CI]     [1/X]                   SRT     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)               LL1     exp(0.01X)

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

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.

This model is made of mahogany with scales on celluloid veneer.
The package included: A box, the slide rule in a brown leather
case, a pamphlet "How to take care..." (with conversion tables)
and a manual ( 126 pages / 1955 ).

Older Version (A)
Has an other scale configuration!

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann       08/11/08