OFFICE OF PUBLIC ROADS. 885 



THE LIBRARY. 



The library of this office contains about 5,000 vohimes. The collec- 

 tion of State publications from the highway departments, geolosrical 

 surveys, agricultural departments, experiment stations, and other* 

 State offices which publish information of interest to highway engi- 

 neers is practically complete. The office has received the city engi- 

 neer's reports, in most cases for the five preceding years, from more 

 than two-thirds of the cities of the United States having more than 

 5,000 inhabitants. The office has also received large collections of 

 city engineer's reports from Australia, Austria, Belgium, British 

 Guiana, Canada, China, Costa Rica, Cuba, Denmark, Ecuador, 

 Egypt, England, France, Germany, India, Ireland, Italy, Jamaica, 

 the Netherlands, Norway, Peru, Roumania, Russia, Salvador, Scot- 

 land, Straits Settlements, Sweden, Switzerland, and the Union of 

 South Africa. 



Seventy-two periodicals are now received at the library, of which 

 31 are received by contribution from the department library and 41 

 are mailed directly from the publishers. Of these periodicals, 59 

 are filed permanently in the library of the Office of Public Roads, 

 while 13 are returned to the department library for further distri- 

 bution. 



The library is now practically entirely catalogued. This work has 

 been pushed very rapidly of late and a great many volumes have been 

 classified and are now thoroughly represented by author and subject 

 cards. 



PHOTOGRAPHIC LABORATORY. 



The work of this laboratory during the year involved the develop- 

 ment of 305 rolls of films and required making 515 negatives, 593 

 bromide enlargements, 2,381 lantern slides, and 13,875 prints. Dur- 

 ing the year 1 J05 lantern slides for lecture work were colored by the 

 artist of the office. 



At the present time the office has 8,237 negatives on file, of which 

 2,237 were added this year. Photographic records of all object-lesson 

 and experimental work and of all roads on which economic studies 

 are being made are kept on file in the office. 



CLASSIFIED EXPENDITURES FOR 1912, BY PROJECTS. 



Expenditures for fiscal year ended June 30, 1912, by projects. 



Appropriations: 



Statutory, Office of Public Roads $.34,020.00 



Road management 20, 000. 00 



Investigating road building and maintenance 54,000.00 



Road material 2.3. 830. 00 



Field exi)erlments 10. 000. 00 



Administrative expenses 12. 870. 00 



Total appropriation 160. 720. 00 



