C-THRU® RULER COMPANY, Hartford, CT / USA                  (1970)
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S C A L E S  of  the   P O C K E T  -  R I E T Z    Model  » 27 «
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Front Side             [ inverse / RED ]                Back Side
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                     <  0 ...  6" Ruler  >
   A          X2
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   B          X2                    S       sin(0.01X); sin(0.1X)
   [CI]       [1/X]                 L       lgX
   C          X                     T       tan( 0.1X ) 
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   D          X
                    <  0 ...  15 cm Ruler  >

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

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

This "Plastic-Sheet" Pocket-SlideRule came in a plastic bag  with
an INSTRUCTION SHEET.  The SR is not precise, but useful, because
under the slider ( in the body ) are CONVERSION-Tables and on the
back side of the slider is a  DECIMAL-EQUIVALENT-Table.  When the
slider is pulled out, it can be used as an INCH / METRIC - RULER.

                  Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann       06/13/13