KEUFFEL & ESSER, New York / USA                       (1961)
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S C A L E S  of  the   » K & E   K - 12 Prep «    Model 4158
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                                          ( one-sided only )
   K       X3
   A       X2
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   B       X2
   S       sin(0.1X); sin(0.01X)
   CI      1/X
   T       tan(0.1X)
   C       X
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   D       X
   L       lgX

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 B ;  T keyed to C

The SR-Body is made of white/green/white plastic layers.
It came in a green soft plastic case with the booklet
» Learning to Use the Slide Rule - Step-By-Step, Easy ... «

                    Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    12/14/08