14 HATCH EXPERIMENT STATION. [Jan. 



Owing to the unsatisfactory records made by some of the 

 Draper self-recording instruments in the tower, it was decided 

 to secure some of other make whose records would be more 

 precise. Accordingly, a triple electric register for recording 

 sunshine, rainfall and v/ind velocity was purchased from 

 Julien P. Friez, and during the summer vacation the wiring 

 was done to put it in working order. The sunshine recorder 

 was mounted on top of the tower and connected by wires to 

 the register in the tower. Two Edison primary batteries 

 furnish the current required to operate the register at inter- 

 vals of one minute while the sun is shining. A tipping- 

 bucket rain gauge on the campus is connected to the register 

 in the tower by more than a thousand feet of wire, and each 

 one-hundredth of an inch of rainfall is registered. This 

 furnishes a record of the rate of precipitation during a storm, 

 as well as the total amount. The record is also checked by 

 measurement in a standard rain gauge. A small anemometer 

 of the Weather Bureau pattern was mounted on top of the 

 tower in place of the Draper rain gauge, which was taken 

 down, and each mile of wind travelled is recorded on the 

 register below. As the drum on which all the above- 

 mentioned records are made travels at a rate of nearly three 

 miles per hour, the records are very distinct, and variations 

 in rate of wind movement, as well as in the rainfall, are easily 

 noted. A set of maximum and minimum thermometers of the 

 Weather Bureau pattern" was purchased during the year, to 

 replace others that were greatly worn. 



The assistant observer, Mr. C. H. Chadwick, was advanced 

 to the position of observer in June, succeeding Mr. G. W. 

 Patch. 



