APPENDIX B LXVII 



The particulars of those received are given in the following table : 



The recoveries have again been poor and it is the intention when 

 the ascensions are resumed to try some other locality that the balloons 

 may stand a better chance of being found. All the results of balloon 

 ascents have been published to date. 



During September, 1917, Mr. Patterson took meteorological 

 observations at Father Point, Quebec, during the acoustic survey by 

 Dr. L. V. King. Small balloons were used for the determination of 

 the wind direction and velocity in the upper atmosphere during each 

 set of observations on the sound signals, and observations with a 

 pilot tube to determine the gustiness of the wind were taken. At the 

 same time records of temperature, pressure, humidity and wind were 

 obtained on self-recording instruments. The work was essentially 

 preliminary in character and it revealed the very great importance 

 of a knowledge of the upper air conditions and the gustiness of the 

 wind, in any investigation on the propagation of fog signals. It 

 also showed that in order to correlate the different phenomena, the 

 special self-recording instruments with an open time scale and the 

 time given by our clocks are required. A special report was made on 

 the subject to Dr. King. 



On Mr. Patterson's return from Father Point, P.Q., he was re- 

 quested to undertake important war work, and as he has had to give 

 almost all his time to his new duties it has been found necessary to 

 curtail the work of the physics branch. 



The observations on evaporation and radiation have been con- 

 tinued, and for the greater part of the year the electrical potential of 



