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OTIS-KING




OTIS-KING  Pocket-Calculator                   Model »L«
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Carbic Ltd., London / England  (1925)         SN = T8156

Diameter:    1 1/2 " ( 3 cm )
Length:      6 " / 10 " ( 15 cm / 25 cm, extended )

1st Log.Scale ( No.429, left of the black slider )
2nd Log.Scale ( No.429, right of the black slider )
3rd Lin.Scale ( No.430, hidden by the black slider )

Used like a Slide-Rule of Length 66" ( 168 cm )
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1st & 2nd Scale together for multiply & devide
1st & 3rd Scale together are a Logarithm-Table


SHORT INSTRUCTION  FOR  ITS  B A S I C  CALCULATIONS ...
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LIST OF ABBREVIATIONS:     US = Upper (2nd) Scale
                           BX = Black slider with
                           UI = Upper Indicator  &
                           LI = Lower Indicator
                           LS = Lower (1st) Scale
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MULTIPLICATION   2*3 = 6   Set LI of BX to X=2 on LS
                           Set X=1 of US on UI
                           Set BX with UI to X=3 on US
                Product:   Read  X=6  on LI
                                 ===
DIVISION    5/3 = 1.6666   Set BX with LI to X=3 on LS
                           Set X=5 of US on UI
   Divident                Set LI of BX to X=1 on LS
  ---(BX)--- = Quotient:   Read  X=1.6666  on UI
    Divisor                      ========

When BX is not movable, exchange LI(LS)/UI(US) or X=1/10

impressum:
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http://public.beuth-hochschule.de/~hamann       02/25/10