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A type of coaxial cable with an air dielectric and aluminum outer conductor which has been in use in Europe since 1948 up to about 200 mc., has been found by recent measurements to be highly efficient in the range 1,000 to 10,000 mc. The cable consists of an inner conductor of copper around which a helical spacer has been built up of polystyrene tapes 2 to 6 mils in thickness, the spacer being covered...
The Bureau would like to receive from industry, and, in particular, from equipment manufacturers, the following types of information on electrical insulating materials: (1) the weak points of the materials, (2) experiences in the use of the materials in equipment, and (3) comments on specification limits for the materials. Data is presented on key properties of three types of insulating materials;...
The dielectric loss of poly o-chlorostyrene plasticized with 20% by weight of diphenyl has been measured with the automatic recorder developed previously (Insulation Conference NRC 1950) in the range 15 cps to 3 × 105 cps and from room temperature to 150°C. The pure polymer, and likewise pure polystyrene show time effects due to thermal history which are absent in sufficiently plasticized material.
The design philosophy first proposed by Hartshorn and Ward has been adopted for a dielectric sample, holder, but with several important refinements. In particular, the holder described is designed to be extremely adaptable for use with many types of measuring equipment, and at low frequencies as well as high.
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