KEUFFEL & ESSER, New York / USA                     (1905)
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S C A L E S   of  the   K & E    Medium Size    Model 4035
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Front Side                                       Back Side
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( 0 ...  8" Ruler )

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

( 0 ... 21 cm Ruler )

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

This unusual 8" slide rule is made of mahogany with scales
on celluloid veneer.  On the back are conversion tables
and constants - given as fractions.  8/505/505 are blind
printed in the woods on its left side.  The slide rule
came in a brown leather case with the  K & E  logo.

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