| Description |
vii, 44 leaves : illustrations ; 29 cm |
| Summary |
"The design and development of a new type of cloud condensation nuclei counter was undertaken to provide a new laboratory and field instrument that operates on a different theoretical basis than the thermal diffusion chamber now being used by meteorologists and other scientists. In the new instrument the test aerosol is pumped through a tube where it is first humidified and then cooled at constant pressure to create a supersaturation, causing water vapor to condense upon the nuclei in the aerosol sample. The concentration of cloud condensation nuclei is then determined by counting the water drops. The control of temperature within the instrument is a critical factor, and the actual temperature control achieved was accurate enough to produce supersaturations as low as 0.5%. However, no activated nuclei were observed, and several reasons are advanced for that failure. Two proposals are made to overcome the deficiencies encountered in the present instrument"--Abstract, leaf ii. |
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