Getting Organized -24- 



of a thin water-soluble film of polyvinyl alcohol to supercool. ^1) The other 

 (Vonnegut) utilized the cooling effect of the ice crystals when they struck a 

 hot wire carrying an electric current.' '®> 



Uniform Particle Generator . A useful tool in the study of cloud physics 

 is an apparatus for producing particles of uniform size, developed (Vonnegut) 

 during the work on one of the ice nuclei detectors.^ '™ With it, particles were 

 produced in sizes down to about 10 microns diameter. 



Salt Particle Detector . An apparatus was constructed (Vonnegut - 

 Neubauer) that detects and counts aerosol particles, such as salt particles, 

 by the pulses of light they produce when they enter a hydrogen flame. Ob- 

 servations showed that the concentration of large sodium-containing particles 

 in the atmosphere is subject to considerable fluctuation. w4A) 



Cloud Chamber . A very simple but effective adaptation of the con- 

 tinuous cloud chamber was developed by Schaefer, using water instead of 

 alcohol/ '' It gave promise of considerable value in conducting quanti- 

 tative experiments with a controlled atmosphere. 



Aerosol Precipitator. A very simple apparatus was constructed by 

 Vonnegut to precipitate aerosol particles from the atmosphere on a strip 

 of paper. It was found useful in the study of condensation nuclei in the at- 

 mosphere. 



Snowflake Recorder . This device was developed (Schaefer -Falconer - 

 Kearsley) to record the type and concentration of snow crystals reaching the 

 ground during the storm period of the winter season. It utilized a strip of 

 paper on which was rubbed a water -sensitive dye„(78) 



Cloud Type Indicator (Schaefer-Falconer). Ey measuring the daylight 

 from a small portion of the northern sky, it was found that the variations in 

 reflection caused by blue sky or various cloud types which passed this area 

 produced a curve which could be interpreted in terms of particular types of 

 cloud. (6) 



