KEUFFEL & ESSER, Hoboken, NewJersey / USA   SN = 685365  (1949)
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S C A L E S  of the  » LOG LOG DUPLEX DECITRIG «  Model N4081-3
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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)]              K       X3 
DF       πX                     A       X2 
---------------------------------------------------------------
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)]
---------------------------------------------------------------
D        X                      D       X 
LL3      exp(X)                 L       lgX
LL2      exp(0.1X)              LL1     exp(0.01X)

REMARKS:
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The »K+E« catalog of 1949 shows on pages 236 + 237 both sides
of this slide rule with explanations...       Have a look!

This model is made of mahogany with scales on celluloid veneer.
The package included: A box, the slide rule in a black leather
case, a pamphlet "How to take care..." (with conversion tables)
and a manual ( 124 pages / 1947 ).

The leather case can be clipped on the user's belt - typical
for the USA:  As seen in the "Western Movies" ready for a
"quick draw".

                      Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann      11/24/07