SCALES of the  GILSON  » B I N A R Y «  CIRCULAR SLIDE RULE    (1940)
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                 made by GILSON SLIDE RULE CO., Stuart, Florida / USA

Front Side with Double Cursor:

( 1)  X
( 2)  1/X
( 3)  X2
( 4)  X3
( 5)  lgX
( 6)  exp(X)     ( Spiral ... )
( 7)  exp(0.1X)
( 8)  exp(0.01X)
( 9)  exp(0.001X)
(10)  Fractions  ( 1 .. 1¼ .. 1½ ..   .. 7/8 .. )  keyed to scale lgX
(11)  Fractions  ( 1/64 .. 1/32 ..  .. 63/64 .. )  keyed to scale lgX
(12)  Drill & Thread Scale   (  V  Form )
(13)  Drill & Thread Scale   ( USF Form )
(14)  MilliMeter Scale ( 25.4 mm  =  1" ) 

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Back Side with Single Cursor:

( 1)  3 DEGREES Circles    ( 0°/90° .. 30°/60° .. 60°/30° .. 90°/0° )
( 2)  3 SIN; COS Circles   ( 0  ...  0.5    ...  0.866  ...  1      )
( 3)  3 TAN; COT Circles   ( 0  ...  0.577  ...  1.732  ...  oo     )
( 4)  Fraction-to-Decimal  Conversion Table   (  1/64   ...  63/64  )


MULTIPLICATION Example:  5 * 3  =  15
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Set the longer cursor LC on 5 and hold it. Set the shorter cursor SC
on 1.  Turn LC ( SC will follow, keeping the angle ) until SC is
over 3.  Read the result under LC.

DIVISION Example:  5 / 3  =  1.666
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Set the longer cursor LC on 5 and hold it. Set the shorter cursor SC
on 3.  Turn LC ( SC will follow, keeping the angle ) until SC is 
over 1.  Read the result under LC.

R E M A R K S :
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The scales of the aluminum slide rule are sealed in celluloid enamel.
This LogLog slide rule was GILSON's most famous circular and was also
distributed under other brand names like DIETZGEN, POST, ...

The  » GILSON BINARY «  MANUAL (14 pages) can be downloaded from

     http://www.sliderulemuseum.com/SR_Library.htm

The scales on the back side are the same as on the  »ATLAS«
» COPYRIGHTED 1931 «

                       Historical Remarks ...
impressum:
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© C.HAMANN        http://public.BHT-Berlin.de/hamann         11/15/07