Vincent Joseph Schaefer, a chemist at General Electric Co. for more than 20 years, died July 25. He was 87 years old.

Schaefer is best known for inventing artificially induced precipitation, called "cloud seeding," by dropping dry ice through natural clouds to produce snow. He worked at GE in Schenectady, N.Y., from 1933 to 1954, the first five years as research assistant to Nobel laureate Irving Langmuir, who won the prize in 1932 for studies in surface chemistry.

In 1959, Schaefer founded the Atmospheric Sciences Research Center at the State University of New York at Albany. He received his Sc.D. from the University of Notre Dame in 1948.

Howard Davis Eberhart, a professor, emeritus, of civil engineering at the University of California, Berkeley, and a pioneer in the development of artificial limbs, died July 18.

He was 86 years old. Because of an accident while performing stress analysis...

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