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PICKETT   ( 10" / 25 cm Scales )
N803-ES   (Front shown)   &   (Back shown)   N803-T



PICKETT, Santa Barbara, California / USA                     (1964)
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SCALES  of the  » ALL METAL LOG LOG DUAL BASE «   Models N803-ES/-T
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Front Side               [ inverse / RED ]                Back Side
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                                    LL0     exp(+0.001X .. +0.01X);
sqrt(X<  ODD-No-Digits >)           [LL0]  [exp(-0.001X .. -0.01X)]
sqrt(X< EVEN-No-Digits >)           LL1       exp(+0.01X .. +0.1X);
K                          X3       [LL1]    [exp(-0.01X .. -0.1X)]
A                          X2       DF                           πX
-------------------------------------------------------------------
B                          X2       CF                           πX
S      sin(0.1X); [cos(0.1X)]       [CIF]                    [1/πX]
ST                 arc(0.01X)
T                   tan(0.1X)       L                           lgX
[CI]                    [1/X]       [CI]                      [1/X]
C                           X       C                             X
-------------------------------------------------------------------
D                           X       D                             X
[DI]                    [1/X]       LL2           exp(+0.1X .. +X);
CFM                       X*M       [LL2]        [exp(-0.1X .. -X)]
                                    LL3            exp(+X .. +10X);
                                    [LL3]         [exp(-X .. -10X)]
REMARKS:
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Model N803 is an improvement of the N800 series. It came with a
leather case, which can be clipped on the user's belt - typical for
the USA: As seen in the "Western Movies" ready for a "quick draw".

This models are made of aluminum. The typical "Pickett-Yellow"
has an "-ES"-Extension in the model-number, means "Eye-Saver".
The white one has a "-T"-Extension, stands for "Traditional".

The term "SYNCRO SCALE" stands for the combined LogLog scales:
They are designed as a uniquely, split long scale, and, because
LL+/- are reciprocal, 2. & .5 (eg.) share the same tick.

The term "DUAL BASE" means:
Using the D scale X, the LL scales result in Power-of-E( X ).
Using the CFM scale X, the LL scales result in Power-of-10( X ). 
< where E=2.71828 ;  M=lg(E)=0.43429 ;  1/M = ln(10)=2.30259 >

                   Historical Remarks ...
impressum:
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© C.HAMANN    http://public.beuth-hochschule.de/~hamann    12/31/06