. The Bell System technical journal . Monthly Averagt-s of Diurnal Variation of Noine New Southgate, Englaml 57,00() Cycles 1923—1924. Monlhiy Average of Diurnal Variation of NoiseBelfast, Maine 15,000 Cycles 1924 502 BELL JOLKXAL «I^Y WlMW MiOl «P».L ■»« JU.! JULY .^«^ST ^ ^S^-Wf ^ pWf ° ^ J^^T?, 1^^*° [

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1