PICKETT & ECKEL, Chicago, Illinois / USA               (1945)
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SCALES of the  » P O C K E T   ALL METAL TRIG «     Model 200
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Front Side                                          Back Side
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  K        X3
  A        X2
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  B        X2                            S        sin(0.1X)
  CI       1/X                           ST       arc
  C        X                             T        tan(0.1X)
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  D        X
  L        lgX

REMARKS:
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This old model was made of magnesium alloy.  It was oxidized
and powdery on the edges and the slider was locked. It had to
be disassembled, the oxidized layers scratched away and to
all sliding parts VASELINE was applied.

                   Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann     12/13/08