APPENDIX B LXXVII 



year. One was a thermograph of the Bristol type. It consisted of a 

 steel bulb filled with mercury inserted in the intake pipe to the 

 condenser and connected by fine steel capillary tubing to the register- 

 ing part. The other was a resistance thermometer inserted in the 

 intake and connected to a VVheatstone Bridge which was adjusted 

 by a special rheostat so that the temperature read directly on a scale 

 to a fifth of a degree. Readings were taken every four hours. While 

 the tubes exposed to the action of the sea water were made of steel 

 or iron, and were practically the same as the pipes in which they 

 were inserted, yet the corrosion was so great that it very soon destroyed 

 the thermometers. This defect is now being remedied, as well as 

 some other minor defects that developed in the resistance ther- 

 mometer. 



Earth temperature thermometers were almost ready for installa- 

 tion last Fall but the freezing of the ground prevented them from 

 being put in. It is proposed to put in a set of thermometers at 

 depths of 4", 10", 20" and 40" to be recorded for a period of eight 

 minutes once in every sixty-four and a surface thermometer to be 

 recorded three times in this interval. Thermometers at the depths 

 5 ft., 6 ft., 9 ft. and 15 ft., to be read once daily, will also be installed. 



Through the courtesy and assistance of Mr. Parkins, of the 

 University of Toronto, extensive observations were made in the Wind 

 Tunnel of the University on the anemometer and much valuable 

 information on the action of the wind on the anemometer has been 

 obtained. The Meteorological Service desires to take this opportunity 

 of expressing to Mr. Parkins and his assistants its grateful appreciation 

 of the services they rendered and of m.aking it possible to carry out 

 the investigation. 



Seismology. — The Milne Seismographs at Toronto and Victoria 

 have been kept in operation throughout the year with little loss of 

 record. No alterations were made in their adjustm.ents, the booms 

 being steady at a period of 18 seconds. 



Toronto recorded 93 disturbances, 45 less than last year, and 

 37 less than the average number for the past seven years. 



The month of May with 13, and August and December with 3, 

 show the greatest and the least number recorded in any month of 

 the year. 



