PICKETT & ECKEL, Chicago, Illinois / USA                 (1948)
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S C A L E S   of  the   » ORTHO-PHASE DUPLEX «       Model 1000
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Front Side                                            Back Side
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K        X3                              L            lgX
A        X2                              DF           πX
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B        X2                              CF           πX
ST       arc(0.01X)                      [CIF]        [1/πX]
T        tan(0.1X) ; [cot(0.1X)]
S        sin(0.1X) ; [cos(0.1X)]         [CI]         [1/X]
C        X                               C            X
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D        X                               D            X
[DI]     [1/X]                           [DI]         [1/X]

REMARKS:
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This historic model is made of aluminum. It came in a cardboard
case together  with an instruction book  by Maurice L. Hartung.
MouseOver the cursor  in the picture  to get a detailed pop-up.

                    Historical Remarks ...
impressum:
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© C.HAMANN     http://public.BHT-Berlin.de/hamann      08/08/11