Bernard Vonnegut was an American atmospheric scientist credited with discovering that silver iodide could be used effectively in cloud seeding to produce snow and rain. He was the older brother of American novelist Kurt Vonnegut.
General Electric Research Laboratory
Cloud seeding is a type of weather modification that aims to change the amount or type of precipitation, mitigate hail or disperse fog. The usual objective is to increase rain or snow, either for its own sake or to prevent precipitation from occurring in days afterward.
This image explaining cloud seeding shows a substance – either silver iodide or dry ice – being dumped onto the cloud, which then becomes a rain shower. The process shown in the upper-right is what is happening in the cloud and the process of condensation upon the introduced material.
Ground Based Silver Iodide Generator – Colorado, US
Beech 18 used dry ice for cloud seeding in the early postwar era US
Lockheed 18 cloud seeding from Wagga Airport in 1958 Australia