KEUFFEL & ESSER, New York / USA     SN = 070386      (1930)
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S C A L E S   of  the   K & E    »FAVORITE«      Model 4056
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Front Side                                        Back Side
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A       X2
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B       X2                    S       sin(0.01X); sin(0.1X)
                              L       lgX
C       X                     T       tan(0.1X)
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D       X

R E M A R K S :                  (  1° = 60' ;   1' = 60" )
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The TRIGONOMETRIC SCALES  are  in   MINUTES(') & SECONDS(")

S keyed to A/B ;  T keyed to C/D

The slide rule is made of mahogany with scales on celluloid
veneer.  On the back are conversion tables and constants -
given as fractions.  It came in a black cardboard case with
the fading inscription  » K & E FAVORITE SLIDE RULE 4056 «

                    Historical Remarks ...
impressum:
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© C.HAMANN   http://public.BHT-Berlin.de/hamann    08/12/09