22 FINAL ACT OF SECOND PAN AMERICAN SCIENTIFIC CONGRESS. 



Concrete under exposure in salt and fresh waters; soils as regards pres- 

 sures thereon; and protection of sandy seacoast shores against 

 erosion. 



MARINE ENGINEERING. 



Coast guards, lighthouses, light vessels, fog signals, buoys; governmental 

 and merchant marine; shallow draft boats and barges; including 

 hydroplanes for freight and passenger service. 



AERONAUTICS. 



Airships to join Pan American States. 



ELECTRICAL ENGINEERING. 



Electrical codes and standards, including acceptance tests of electrical 

 apparatus; electric current and flow; calculation and construction 

 of electric-transmission lines; electrification of transportation 

 lines; aluminum conductors, and underground cables. 



Hydroelectric utilization of waterfalls. 



Electrochemical and industrial applications of electricity. 



Recent telegraphic and telephonic developments, including radio-teleg- 

 raphy. 



RECLAMATION, SANITATION, AND THE SUPPLY AND USE OF WATER. 



Governmental and private reclamation work in North and South America ; 

 irrigation and drainage, including the use of irrigation waters as 

 sources of power; sanitary engineering, including sewage, street 

 cleaning and refuse disposal, municipal water supply; laws govern- 

 ing use of running water and waterfalls and the construction work 

 and present status of water powers in North and South America. 



MECHANICAL ENGINEERING. 



The gyroscope applied to aerial and water navigation; chronocyclegraph 

 motion-recording devices; agricultural implements and machinery; 

 overhead conveyors or transporters in port terminals and ware- 

 houses; and the economy of steam-power plants, using Pan 

 American fuels. 



NOMENCLATURE, STANDARDS, SURVEYS, BUILDING, MATHEMATICS, AND MISCEL- 

 LANEOUS. 



Engineering nomenclature; governmental Bureau of Standards; govern- 

 mental and private geodetical, geographic, hydrographic, and geo- 

 logical work. 



Governmental work of public buildings and grounds in the United States 

 of America; new properties of involution of conic sections; new 

 methods of diagonal notation. 



