DEPARTMENT OF BOTANICAL RESEARCH. 



65 



Laboratory. The completed work will also embrace a series of comparisons 

 of this feature through a series of seasons. 



Automatic Rainmeter. — Mr. H. de Raasloff, C. E., has continued his 

 experimental study of a design for an apparatus which may be taken to the 

 outlying stations of the Desert Laboratory and left to register automatically 

 the rainfall for extended periods of irregular length, perhaps for months. A 

 successful solution has been reached, and one instrument is now installed at 

 the Desert Laboratory, preliminary to the complete organization of the out- 

 lying stations. The principle underlying the design is that after it has been 



Cubic inches 



Revolutions of 

 large wheel 



The De Raasloff Automatic Rainmeter. 



5— YB 



