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Portable Cold Chamber. ..................... 23 



Ice Nuclei Detectors ........................ 23 



Uniform Particle Generator. . .7 ............. * 24 



Salt Particle Detector ....................... 24 



Cloud Chamber ............................. 24 



Aerosol Precipitator ........................ 24 



Snowflake Recorder ......................... 24 



Cloud Type Indicator ........................ 24 



IV - Laboratory Studies ............................... 25 



Personnel .................................... 25 



Ice Nuclei .................................... 26 



Adiabatic Expansion of Gas .................. 27 



Chemical Effects ........................... 27 



Spontaneous Formation ...................... 28 



Structure .................................. 28 



Crystal Growth & Multiplication .............. 28 



Silver Iodide .................................. 28 



Raindrop Studies .............................. 30 



Condensation Nuclei ........................... 31 



Electrical Phenomena ......................... 31 



Workman-Reynolds Effect ................... 32 



Electrical Atomization ...................... 32 



Study of Cloud Types .......................... 32 



Analytical Work ............................... 32 



V - Cirrus & Stratus Studies .......................... 35 



Cirrus Clouds. ................................ 35 



Natural Formation 35 



Height, Temperature, etc.. .................. 36 



Stratus Clouds ................................ 36 



VI - Cumulus Studies ................................. 39 



Honduras ..................................... 39 



April 18, 1949 ............................. 40 



Priest River Study. ............................ 42 



Results in Hawaii. ............................. 42 



Rain Chain Reaction ........................... 43 



Studies in Puerto Rico ......................... 44 



Early Work in New Mexico ..................... 45 



Silver Iodide at New Mexico 47 



