EEPOETS 



Olf THE 



STATE OF SCIENCE. 



-*•• 



Meteorological Ohservator;/, Montreal. — Report of iko Committee, cov- 

 sistinr/ of Professor H. L. Callendak {Chairman), I'rofessor C. 

 McLeod (Secretari/), Professor F. Adams, and Mr. R. P. Stupart, 

 appointed for tlie pitrpose of estahllsliinu a Meteoruloijical Ohservator [/ 

 on Mount Royal, Montreal. 



[PLATE I.] 



The following preliminary report lias been received from the observers : — 

 The difference of temperature between the College Observatory and 

 the top of Mount Royal is continuously recorded by means of a Callendar 

 Electric Recorder and a pair of differential platinum thermometers. The 

 thermometers are of the usual pattern, giving a change of 2 ohms for 

 100° Fahr., and the scale of the record is one-fifth of an inch to the 

 degree Fahr. By a simple change in the connections the actual tempera- 

 ture at either station can be recorded separately instead of the difference 

 of temperature between the two. The thermometer at the top of the 

 mountain is placed on a platform 50 feet above the ground and 850 feet 

 above sea level. The other thermometer is at a height of 4 feet above the 

 ground, and 180 feet above sea level. The distance between the two is 

 rather more than a mile. The recoi'der is placed in the College Oliserva- 

 tory at the lower station, and is connected to the distant thermometer by 

 four separate lines of No. 12 copper wire erected on poles with glass 

 insulators, and covered with weather-j^roof insulation ordinarily used for 

 telephone work. The recorder is of the original Callendar pattern, and 

 was made at the McDonald Physics Building in 1897. 



The line to the mountain has been broken by storm on several occa- 

 sions ; parts of it have sometimes been carried away by thieves ; on one 

 occasion the line Avas struck by lightning, the thermometers were de- 

 stroyed, and the instrument burnt out ; on another occasion the instrument 

 was burnt out through an accidental short cii-cuit of the electric lighting 

 current. The original thermometers which were damaged by lightning 

 have been replaced by new and improved instruments, and all other 

 damages have been repaired, so that the whole apparatus is at present in 

 good running condition. Great delay has been caused by these accidents ; 

 and this, coupled with pressure of other work on the observers, has made 

 it impossible to secure up to the present date a sufficiently extended series 

 1000 D . 



