TABLE OF CONTENTS 



Page 



I - Introduction . . . . ... . „ .................... ...... • • • • •■ • • 1 



II - Early History ...... r .\ .......■..>...■■. : •■ v ■••-••• • 3 



Gas Masks & Smoke Filters ................... 3 



Smoke Generators .......*..,.,..:.,......*....?;..•.•.•■.•••• 3 



Precipitation Static .......,...............•••»• 



Aircraft Icing . . . . . . . . . ...» ..................... . 



Cloud Studies at Mt. Washington. ................ 5 



Nucleation .................■......•••••«»••••■"'■ 



Schaefer's Cold Box. .„..,..............,....•...••■• 6 



Vonnegut's Early Work - Cloud Studies at M. I. T. 7 



Supercooling .............,........••«.•.•••'">•• ' 



Supercooling of Metals . .... * .......... ......... . 8 



Nucleation Studies ........,..,.......■..."■.......•••..■ 



Silver Iodide ............. ° ...... ...... ...... . 



Langmuir's Early Seeding Calculations ......... 



First Man-made Snowstorm. ................... 9 



Other Early Flights .............. ° ......... ° ° • H 



Establishment of Project Cirrus ............... 12 



III - Getting Organized ............. ...................... • 15 



Contractual History ...................:...-•.»•• 15 



Organization ......................... r .. .••......••• ■ 1° 



Flight Program. . . . ...................... • ■ « . • 17 



Ground Operations ...................... ° ° . ° ° - 19 



Weather Station .......'. ...... ........ ..... % . .... • • 19 



Photography. .......... ... ; .......*........- ••■•■•.*••••• • 20 



Instrumentation ....................... ° •« ° ° - ■ 21 



Dry Ice Dispenser. ......................... 21 



Dry Ice Crusher. ........... ..T .....,.........••».• • 21 



Silver Iodide Generators .................... 21 



Camera Clinometer. ........................ 22 



Flight Instruments ................. ° «... ° ° ° 22 



"Weather" Instruments .................... 22 



Cloud Meter ..................... ° .... ° — ° 22 



Condensation Nuclei Detector. ............... 22 



Vortex Thermometer ....................... 23 



Vortex Speed Indicator. ..................... 23 



Rain Catcher. ...... ....................... » 23 



