Method of starting precipitation e.g. fall of rain - entails lowering temp. in area where fall is required

摘要

The process is partic. applicable during dry but overcast weather, and entails the creation of a temperature drop in the area where the fall is required. The effect may be obtained by the use of gravity or pressurised sprinkling machines with or without jets and mounted on self-propelled flying, floating or rolling engines. Surfaces treated may inc. plantations.