522 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



A goods roads disj^lay at Wilmington, Dol., by the State highway 

 dojiarlmont of DebiAvare. November 21-25, 1919, 



The Dayton Automobile Exposition, Dayton, Ohio, January 12- 

 17, 1920. " 



The Ohio Good Roads Association, Columbus, Ohio, January 19- 

 24, 1920. 



Evansville Chamber of Commerce, Evansville, Ind., March 22, 1920. 



ADDRESSES, LECTURES, AND PAPERS. 



The practice of rendering technical advice through the medium of 

 conferences, lectures, and the presentation of papers at public gather- 

 ings was continued during the year. Representatives were assigned 

 to attend only those meetings and conferences of official bodies which 

 were of State or Nation-wide importance. Ninety-seven special 

 authorizations were approved by the Secretary's office for the detail 

 of representatives of the bureau to attend special meetings of tech- 

 nical societies and associations and other meetings having a du*ect or 

 an indirect interest in or influence on highway improvements. Of 

 these authorizations 57 carried authority to deliver stated addresses, 

 the remainder to attend and participate in the gathering. 



PHOTOGRAPHIC WORK. 



There were developed in the photographic laboratory 3,488 nega- 

 tives, 19,410 prints were made, 1,064 lantern slides, 527 bromide en- 

 largements, and 2,187 photostat prints. 



In addition to this work 788 lantern slides were colored for lecture 

 work, 193 bromide enlargements were painted for exhibition pur- 

 poses, and 34 maps were mounted on cloth. 



For the use of various individuals and organizations, including 

 employees of the office, 3,043 lantern slides, 15,268 prints, and 394 

 bromide enlargements were loaned. At the close of the year the 

 photographic files contained 22,057 negatives, 82,932 prints, and 

 11,543 lantern slides, showing a substantial increase in all branches 

 of photographic work OA^er the work performed during the previous 

 fiscal year. 



PUBLICATIONS. 



Twelve publications dealing with special phases of the work of the 

 bureau were issued during the year — tlu^ee by the division of irriga- 

 tion investigations, four by the division of drainage investigations, 

 three by the division of rural engineering investigations, one by the 

 highways division, and the annual report of the bureau. 



In addition to these special publications, the bureau continued 

 the publication of the monthly magazine, Public Roads, dealing with 

 matters of interest to highway engineers, especially in connection 

 with Federal-aid work. 



One of the handicaps from which the bureau suffers is the in- 

 sufficiency of the funds allotted to it for publication. A great amount 

 of valuable information is acquired each year which it is impossible to 

 issue in the form of publications of the department because of the 

 limitation of the printing funds. The demand for Public Roads has 

 grown to the point where it has become necessary to refuse requests 

 for it, because the funds limit the size of the issue to 4,500 monthly. 



