TIIK rK.\( IK "AI. AI'i'l.K \i 1().\ ()!• CMMAriC DATA* 

 H\ I'dKD A. ( ■,\KiM:\ri;K. 



The (iri'imi of the Aiiuiic ,iii iii;m i>\ ^■ iciKc is lo pr.iclii ;ili/c his 

 yprciahy so that it ma\' be i^i diin i \aliii' lo ihc [tuhlic. 



The Los Anpeles (hamluT nf ( Hiiinicii c in (i-catinij; a dcparltnent 

 of meteorology and aeronautics made it possible to utilize for the ^oofl 

 of the pul)Iic the vast storehouse of meteorological and aeronautical 

 information which has been steadi'y increasing for over forty years. 

 Ihc imperative needs of the Southern California public of intensive 

 local application of weather knowledge were in mind when such an 

 epochal step was taken. 



The jG;eneral aim of iliis departiiimt is to co-ordinate all air 

 knowledge whether it be that of the Weather I'.ureau or of the mili- 

 tary branches of the government. A Fellow of the Royal Meterolog- 

 ical Society once said that he wished that the mere collection of 

 weather data might cease for eight or ten years, or long enough to 

 permit some direct use being made of it. This is one of the objects of 

 this department. .Another is the erection of facilities for making com- 

 parative studies, therefore it is legitfmate for this department to make 

 climatic comparisons and deductions which is a course naturally im- 

 possible for any Federal bureau. 



In the field of meteorology papers have been already published on 

 "School Attendance and Weather." Work along meteorological lines 

 has been of special value in beginning intensive climatic surveys. The 

 manager of the department, while official in charge of the Los An- 

 geles Weather Bureau office finished a five year study of a 16,000 

 acre ranch in this vicinity. This work was accomplished in an unof- 

 ficial capacity and was complimentary to the owners. This inaugu- 

 rated a new era in indicating zones for different horticultural and agri- 

 cultural plantings. The success attending that venture made it pos- 

 sible, last November, to begin a similar climatic investigation of 47,- 

 000 acres. The methods are as follows: 



Automatic registration of temperature, relative humidity, rainfall, 

 wind and sunshine is secured throughout this tract by the establish- 

 ment of a number of stations scattered over the district. The results 

 are tabulated, profiles are made by months over a period of two or 

 more years. The accumulated data permit climatic areas to be plotted 

 so that it will be feasible to accurately indicate zones where plantings 

 of avocados, lemons, oranges, or other fruits may be successfully 

 grown as well as early vegetables, beans, grains, etc. It will be read- 

 ily seen that such a method will add materially to the security of in- 

 vestments in land holdings. 



*0n Sept. 16, 1919, the Los Angeles Chamber of Commerce created a De- 

 partment of Meteorology and Aeronautics and placed Dr. Carpenter in charge. 

 In addition to managing this department Dr. Carpenter is a member of the fac- 

 ulty of the southern branch of the University of California as lecturer in 

 meteorology and is also a practising consulting meteorologist. In the latter capac- 

 ity he is a pioneer in the commercial field. 



