. The Bell System technical journal . ^ the metal luidersheath and a probe slidingon the sheath svu-face. A test set as shoA\Ti in Fig. 5 was developed which Iosponds to changes 562 THE BELL SYSTEM TECHNICAL JOUKNAL, MAY 1954. tube and die assembled in extruder head and die adjusting in capacitance. The capacitance response is in turn calibrated in thou-sandths of an inch of sheath thickness. The electronic system of the sethas been described in the Bell System Technical Journal previously.* Itis practical from test set measurements to control the concentricity ofAlpeth cable to within 35 per
. The Bell System technical journal . ^ the metal luidersheath and a probe slidingon the sheath svu-face. A test set as shoA\Ti in Fig. 5 was developed which Iosponds to changes 562 THE BELL SYSTEM TECHNICAL JOUKNAL, MAY 1954. tube and die assembled in extruder head and die adjusting in capacitance. The capacitance response is in turn calibrated in thou-sandths of an inch of sheath thickness. The electronic system of the sethas been described in the Bell System Technical Journal previously.* Itis practical from test set measurements to control the concentricity ofAlpeth cable to within 35 per cent and Stalpeth to within 20 per thicknesses within ± inch are maintained. Formerly, the safe practice was to use an excess of approximately 10per cent over specified average in order to keep the thin side of eccentricsheath ^\ithin the minimum spot limit. Control from test set measure-ments eliminated the necessity of using an excess of polyethylene becausesheath of improved concentricity maintained close to the specified av-erage thickness does not vary below the specified minimum spot thick-ness. The quality of the sheath is improved because it is of consistentlyhigh dimensional unifonnity not p
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
