1907.] PUBLIC DOCUMENT — No. 33. 21 



KEPORT OF THE METEOROLOGIST. 



J. E. OSTRANDER. 



The work of the meteorological division during the past 

 year has been continued along the same lines as in previous 

 years. While changes in the instruments at times are neces- 

 sary^ and a modification in the form of the records must 

 occasionally be made, these are avoided unless the necessity 

 is very apparent. The value of a set of records at any sta- 

 tion is dependent on the uniformity with which they have 

 been made, as well as on the length of time covered. Not- 

 withstanding the objections to a change, it was considered 

 advisable at the beginning of the year to discontinue the pub- 

 lication of the wind movement as given by the Draper ane- 

 mometer, and to use instead that given by the electric register 

 which was installed last year. This was done so that our 

 records would be better comparable with those of the United 

 States Weather Bureau meteorological stations, which use 

 electric recorders. A comparison of the two records at this 

 station shows a difference of from 5 to 10 per cent, in the 

 total movement during a month, that of the electric register 

 usually being the larger. The Draper records are still taken, 

 and will be continued during the coming year for the purpose 

 of further comparison. 



The records of the electric sunshine recorder have been 

 substituted for those of the Draper instrument, and, while 

 they are made more precise, it is not thought that the monthly 

 results are materially affected by the change. 



With the close of the year the records for eighteen years 

 will be complete. A summary of the records for the first ten 

 years was published in the report for 1900. This summary 

 has been carried along to date for the purpose of deducing 



