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GILSON  » MIDGET  BINARY  «
POCKET  CIRCULAR  SLIDE  RULE
( 4  1/4"  /  11 cm  Diameter )

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SCALES of the  GILSON  » MIDGET BINARY «  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)  lgX
( 4)  X2         ( decimal )
( 5)  X2         ( fractional )
( 6)  exp(X)     ( Spiral ... )
( 7)  exp(0.1X) 
( 8)  Fractions  ( 1/64 .. 1/32 ..  .. 63/64 .. )  keyed to scale lgX
( 9)  Drill & Thread Scale   (  V  Form )
(10)  Drill & Thread Scale   ( USF Form )
(11)  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 case of the MIDGET is made of oilcloth -- a material typical for
the '50s.  The scales are on aluminum and sealed in celluloid enamel.
This LogLog POCKET slide rule was also distributed under other brand
names like DIETZGEN, POST, ...

The  » GILSON MIDGET BINARY «  MANUAL (14 p.) 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.beuth-hochschule.de/~hamann     11/14/07