504 



BELL SYSTEM TECtlMCAL JOURX.IL 



ocTOBcn wvtiacB «cn«CT 



Moiithh A\tr.ini- I if Diurnal \ari.ilioii of Ncisc 

 Kivtrhea<l, I.. I. SO.OOO Cyclts 



V)24 



MdiilliK Avfnuji' "f Diiini.il Variation of N'oist- 

 kivcrlu-a.l, I.. I. 24,000 Cycles 



1924 



