322 ANNUAL EEPOETS OF DEPAETMENT OF AGEICULTUKE. 



road officials and afforded excellent means of conveying to such 

 officials needed information. 



MODELS AND EXHIBITS. 



Exhibits consisting of models and enlarged photographs illustrat- 

 ing the best method of road, bridge, and culvert construction; road 

 drainage, maintenance, repair, and roadway treatment; and road- 

 building machinery and equipment have been made during the year 

 at expositions, congresses, conventions, and fairs. 



Exhibits furnished by the office were made during the year at the 

 following places, under the auspices of the organizations named : 



American Road Congress, Atlanta, Ga. 



Annual Convention of American Road Builders' Association, Chicago. 



Annual Convention of Peoria County Good Roads Association, Peoria, 111. 



International Dry Farming Congress, Wichita, Kans. 



Boston Domestic Science and Pure Food Exposition, Boston, Mass. 



Seventh Annual Convention, Michigan Good Roads Association, Grand 



Rapids, Mich. 

 Montana Road Congress, Great Falls, Mont. 

 Northwestern Road Congress, Milwaukee, Wis. 

 Civic and Industrial Exhibition, Norwalk, Conn. 

 State Fair, Louisville, Ky. 

 State Exposition, Portland, Me. 

 West Michigan State Fair, Grand Rapids, Mich. 

 Ohio-Michigan Land Show, Toledo, Ohio. 

 State Fair, Columbus, Ohio. 

 National Sportsmen's Show, New York City. 

 Panama-Pacific Exposition, San Francisco, Cal. 

 Annual Convention of Arkansas Press Association, Harrison, Ark. 



In addition, exhibits were made at the West Virginia State Uni- 

 versity, Morgantown, W. Va., during the road school ; at Indianap- 

 olis, Ind., in the State Capitol, during the session of the legislature 

 for the months of January and February ; and during the session of 

 the legislature in Little Rock, Ark. Models have also been on exhibi- 

 tion under the auspices of the State highway department at Mont- 

 gomery, Ala. 



The total estimated attendance of persons who examined the ex- 

 hibits at the various gatherings was 440,438, as against 300,000 dur- 

 ing the year 1914. The cost of installation, drayage, freight, and re- 

 packing was paid by the exposition companies or other organizations, 

 except in the case of the exhibit at Wichita, Kans., where all expenses 

 were paid out of a special fund appropriated by Congress. 



PHOTOGRAPHIC WORK AND PREPARATION OF MODELS. 



In the photographic laboratory 3.304 negatives, 13,250 prints, 

 2,418 lantern slides, 198 bromide enlargements, 64 Vandyke prints, 

 and 10,502 blue prints were prepared. The negatives on file in the 

 office at the close of the fiscal year numbered 12,995. During the year 

 2,017 lantern slides were colored. In the reclassification of the 

 lantern-slide files a number of the slides were discarded as obsolete 

 and a number have been damaged in shipments of loan collections, 

 leaving 6,992 slides now in the office collection. Fifty-four sets of 

 slides have been loaned this fiscal year, exclusive of those used in 

 lectures given by employees of the office. 



