LXXXIV 
THE ROYAL SOCIETY OF CANADA 





Temp. at | Height of | Temp. at 
Greatest | Greatest Strato- base of Remarks 
Date Height Height sphere Strato- 
sphere 
1915 
ApritO se. 51242 teh LL 3 Mis 7 OPR: 7-3 Mis.| —73°F 
une 2nd eae 6-6 Mls.| -62°F. Not (Found in 
reached Lake Huron) 
Juneisud/ esos ce 7-3 Mis.| -68°F. Not (Found in 
reached Lake Erie) 
Nov. 11th......... 9.6 Mis.| -82°F. | 7-5 Mis.| -88°F. | 
1916 
Feb 29h27 GMIS |) (54.98. 5-9 Mis. | —72°F. 




The ascent of June 2nd is very interesting as showing the height 
to which the southeaster@y current extended; it is the third occasion 
on which a balloon was found west of the starting point. 
The results of all the ascents up to May, 1915, have been worked : 
out in ordinary and absolute units according to the request of the 
International Meteorological Committee, and published in a paper 
on Upper Air Investigation in Canada, Part I, M.S. 51. 
Part 2 of the investigation will contain an account of the kite 
work and is now in the press. A number of records of the pilot 
balloons sent up in the Arctic have been received and from those 
worked out it is anticipated very valuable information will be obtained 
in regard to the Air Currents in the Arctic zone. 
Radiation: The comparison of the Angstrom Pyrheliometer with 
the Callendar Sunshine Receiver has been completed, and the results 
obtained suggest the possibility of designing a new form of sunshine 
receiver that will eliminate some of the defects of the present form. 
The Callendar Sunshine Receiver has been in operation through- 
out the year, and whenever opportunity occurred the measurement 
of the amount of heat received on a surface exposed perpendicularly 
to the sun’s rays have been measured by the Angstrom Pyrheliometer. 
The results to date for both instruments have been reduced, 
and the mean is given in the following table for each month. 

Instrument Jan. | Feb. June | July | Aug.| Sept.| Oct. | Nov.| Dec. | Year 









Callendar-Gram. 
Calories per day on 
a horizontal surface 
OMS CM. 000 203| 270| 280 446 
389 
198 
339| 261 






Angstrom-Gram. 
Calories per min. 
per sq. cm 







1-185}1-209)1-239 1-216'1-079)1-119)1-221)1-110)1-188)1-091/1-167 


