60 



OBSERVATIONS FOR DETERMINING THE HORARY OSCILLATIONS, ETC. 



Data* from which Table No. 3 of corrections for the horary oscillations of the barometric column 



has been deduced. 



These data consist of hourly barometric readings, taken at Fort Reading, Cal., and reduced to what they would havfi been had the temperature 

 of the mercury been 32 Fahr. Barometer used, No. 1060. 



t The reading at this hour was omitted. This assumed value has been found by careful interpolation from the constructed daily curve. 



