. Bell telephone magazine . ests of the twocould be made. Because so much depended on itsoutcome, quartz crystal research wasgiven emphasis and Laboratories en-gineers worked with production spe-cialists of Western Electric on theproblems involved in mass-producingthese precise little pieces of the final designs were testedand found satisfactory on everycount, one of the most difficult prob-lems had been solved. As the job progressed, countlessrough sketches of circuits and layoutswere made. The best of these wereselected by laboratory tests and com-plicated mathematical procedures
. Bell telephone magazine . ests of the twocould be made. Because so much depended on itsoutcome, quartz crystal research wasgiven emphasis and Laboratories en-gineers worked with production spe-cialists of Western Electric on theproblems involved in mass-producingthese precise little pieces of the final designs were testedand found satisfactory on everycount, one of the most difficult prob-lems had been solved. As the job progressed, countlessrough sketches of circuits and layoutswere made. The best of these wereselected by laboratory tests and com-plicated mathematical procedures, andhundreds of working drawings andschematics were prepared. Mechani-cal engineers were called in, for thistank set had to be a mechanicalmasterpiece, with a multitude of gears, cams, and moving parts. Materialsengineers did their part by devisingalternatives to replace the aluminumand copper which it was then recog-nized would become scarce, and byfitting the set for the rough handlingand extremes of temperature it would. A TANK SET gets an inspection at Wes-tern Electrics Hawthorne Works. Thisis one of many tests given before theequipment is turned over to the SignalCorps have to undergo. The Signal Corpsaided in the development by conduct-ing numerous tests and checking theLaboratories results. Hand-mademodels of both transmitter and re-ceiver were completed and given afinal laboratory check. In normaltimes, at least a year would have been Go Bell Telephone Magazine SPRING required for so complex a job as , it was only three montlisfrom the time the Signal Corps madeits request to the Laboratories untilthe first hand-made FM set wascompleted. Passing the Tests The first field test of the finishedequipment was made by the Labora-tories engineers alone. Taking thenew transmitter and receiver somedistance outside New York, thev putthem through their paces—and theresults were gratifying. Next theequipment was taken to Fort Mon-mouth, where it was tested and ap-p
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