. The Bell System technical journal . Fig. 1—Point contact rectifier structures. 1934-1943. Approximately f actual size. that they be easily adjusted. Considering the known vagaries of the deviceshistorical counterpart, it was considered prudent to provide in the structuresmeans by which the unit could be readjusted as frequently as might provenecessary or desirable. 4 BELL SYSTEM TECHNICAL JOURNAL As the properties of various semi-conductors were known to vary widely,an essential part of the early work was a survey of the properties of a numberof minerals and metalloids potentially useful as


. The Bell System technical journal . Fig. 1—Point contact rectifier structures. 1934-1943. Approximately f actual size. that they be easily adjusted. Considering the known vagaries of the deviceshistorical counterpart, it was considered prudent to provide in the structuresmeans by which the unit could be readjusted as frequently as might provenecessary or desirable. 4 BELL SYSTEM TECHNICAL JOURNAL As the properties of various semi-conductors were known to vary widely,an essential part of the early work was a survey of the properties of a numberof minerals and metalloids potentially useful as rectifier materials. Therewere examined and tested approximately 100 materials, including zincite,molybdenite, galena, iron pyrites, silicon carbide, and silicon. Of thematerials investigated most were found to be unsuitable for one reasonor another, and iron pyrites and silicon were selected as having the bestoverall characteristics. The subsequent studies were then directed towardimproving the rectifying material, the rectifying


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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1