482 



SCIENTIFIC RESULTS OF ZIEGLER POLAR EXPEDITION 



Summary of amplitudes and phase angles of periodic functions representing the diurnal variation in 



atmospheric pressure at Cape Flora 



A p = ^ sin (0 + C, I + /?, sin (26 + C,) + B s sin (30 + Q 



NOTE. In these expressions the angle 8 counts from o hour A. M. 



as o c 



GENERAL REMARKS 



It is of interest to note that the corrections necessary to the means of the daily observa- 

 tions made at 8 A. M., noon, and 8 p. M. to obtain the mean results from continuous registra- 

 tion of atmospheric pressure and temperature are small. Thus at Teplitz Bay this correction 

 over the period of observation to reduce the mean of the three daily readings of thermometers 

 to mean thermogratn is o. 10 F ; corresponding correction for atmospheric pressure is .005 

 inch. At Cape Flora, where only barograms were made, the correction is .003 inch. 



In connection with storm periods it was found that the temperature was even a better 

 means of forecasting than the barometer, sudden and rapid rising of temperature being almost 

 always accompanied by severe storms. Typical storm thermograms and barograms recorded 

 at Teplitz Bay are shown in figures 4 and 5. 



As will be seen from the tabulations of percentages of observed wind directions, the pre- 

 vailing winds at Teplitz Bay are from the east; during September to December, 1903, in 

 general from the east and southeast ; during January and February, 1904, iu general from the 

 east and south; during March and April, 1904, generally from the north and east. At Cape 

 Flora, as already stated, the proximity of the high cliffs interferes with the winds ; as recorded 

 the prevailing winds during October to April are from the east and northeast, during May to 

 July from the west and northwest, while during August and September they are variable with 

 no very decided preponderance of direction. The summary of hourly wind movements at 

 Teplitz Bay does not indicate any very characteristic diurnal variation over the mean period 

 of record. 



