122 MASS. EXPERIMENT STATION BULLETIN 153. 



cipitation, and the tipping bucket electrical recording gauge in 

 determining the time and rate. 



The Draper self-registering thermometer, Weather Bureau 

 pattern, maximum and minimum thermometers and hygrom- 

 eter are in a standard shelter about 4 feet above ground and 

 220 feet above sea level. 



On Jan. 1, 1904, the time of making observations was changed 

 from 7 A.M., 2 p.m. and 9 p.m. to 8 a.m. and 8 p.m., so as to 

 conform with the practice of the United States Weather 

 Bureau. This change should be noted in comparing the dew 

 point and relative humidity before and after that date. Other 

 data are probably not affected by the change. 



