Atmospheric-Electric Observations, 1915-16 



397 



METEOROLOGICAL OBSERVATIONS. 



The meteorological elements are determined according to well-known methods, and no 

 special mention of the procedure is necessary, further than to record that the relative 

 humidity was obtained by means of a sling hygrometer, the atmospheric pressure by means 

 of a mercurial barometer, and the temperature by an ordinary thermometer, with the 

 exercise of the usual precautions. A barograph and a thermograph are also in use for the 

 purpose of obtainmg continuous records. The meteorological observations are recorded 

 as shown on page 401, and on the same form is recorded also the summary of the atmos- 

 pheric-electric observations for the day. 



SPECIMENS OF OBSERVATIONS AND OF COMPUTATIONS. 



EXPLANATORY REMARKS. 



The forms are almost self-explanatory when read in conjunction with the account 

 of the method of procedure as given on pages 377-396. The letter d, over many of the num- 

 bers, indicates that these numbers are recorded in scale divisions of the electroscope. Adja- 

 cent to such readings the corresponding values are recorded in volts when necessary. 



Atmospheric-Electric Observatwns: Polential-Gradient 



(Form 102) 



Station: At sea 

 DaU: Jan. 1.5, 1916 

 instrument: P. G. A. 2 



Lai: 54?3 S 

 Com'd'r: 3. P. 

 Watch: 70 



A. 



Long: 326?8 E 

 Obs'r: I. A. L. 



'Fi = potential of disk after fixed movement. 



'A = auxiliary potential on electroscope ; it is taken as positive when its sign is 

 opposite to that of V. 



