Bernard Vonnegut, a University scientist recognized internationally for his discovery of cloud-seeding techniques and his research into the nature of thunderstorms, died Friday, April 15, at St. Peter's Hospice in Albany. He was 82.
During over 50 years of research into nature's mysteries, he increased our understanding of clouds, tornadoes, and atmospheric electricity, especially lightning. In 1946, his discovery of the efficacy of silver iodide as a cloud-seeding agent transformed the science of rainfall modification. For the last four decades, a major focus of his research had been the question of how a billowy cloud can became a high-voltage generator (lightning) spewing out sparks that can stretch many miles across the skies.
While he was best known for his cloud-seeding discovery and his lightning research, he was also known for his wide-ranging curiosity and ingenuity. While he had formally retired from the University in 1985, he continued to be a daily presence on campus and to pursue his investigations until virtually the final days of his life. He held over two dozen patents and produced a far larger number of truly ingenious solutions to instrumentation problems. He published prolifically and was an enthusiastic teacher. Students were frequently listed as co-authors of his publications.
Vonnegut was named a distinguished professor, the highest rank in the State University of New York system, in 1983. He had joined the University faculty in 1967.
In his investigations of thunderstorms and lightning, Vonnegut employed the data and tools used by many atmospheric scientists, such as weather balloons with instruments that track atmospheric phenomena. But he also employed more novel approaches. In 1982, photographs of lightning were taken from the Space Shuttle Columbia as part of any experiment carried out on behalf of Vonnegut and two other scientists. The photographs showed lightning stretching across surprisingly vast stretches of sky - 40 or 50 miles at least.
In 1986, Vonnegut and Charles Moore of New Mexico Institute of Mining and Technology in Socorro, N.M., used an electrified wire stretched 1.2 miles across a New Mexico canyon to create "upside-down" thunderclouds. Those experiments, said Vonnegut and Moore, suggested that small charges present in the atmosphere during the formation of a thundercloud may trigger the electrification of the cloud and that the kind of charge that is present, negative or positive, determines the cloud's polarity.
In 1954, Vonnegut first proposed his "convection" theory of cloud electrification, which holds that strong winds blowing up and down in clouds are primarily responsible for cloud electrification and that the resulting lightning plays an important role in the formation of rain. He often noted that his theory was regarded as a "kind of heresy" in the field, but that did not deter his investigations.
He was born Aug. 29, 1914, in Indianapolis, Ind., and earned his bachelor's degree in chemistry and his doctorate in physical chemistry at the Massachusetts Institute of Technology. Before he joined the faculty at Albany, he worked at Arthur D. Little in Cambridge, Mass., and at the General Electric Research Laboratory in Schenectady. Mary Fiess