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A hail cannon is a pseudoscientific device and purported shock wave generator claimed to disrupt the formation of hailstones in the atmosphere. These devices frequently engender conflict between farmers and neighbors when used,("Residents Protest Hail Cannons" ) because they are repeatedly fired every 1 to 10 seconds while a storm is approaching and until it has passed through the area, yet there is no scientific evidence for their effectiveness.==Historical use==In the French wine-growing regions church-bells were traditionally rung in the face of oncoming storms,("Hail cannons of France" ), 1905 later replaced by firing rockets or cannons.("Do cannons and rockets dispel hail storms?" ), 1909
A hail cannon is a pseudoscientific device and purported shock wave generator claimed to disrupt the formation of hailstones in the atmosphere.
These devices frequently engender conflict between farmers and neighbors when used,〔("Residents Protest Hail Cannons" )〕 because they are repeatedly fired every 1 to 10 seconds while a storm is approaching and until it has passed through the area, yet there is no scientific evidence for their effectiveness.
==Historical use==
In the French wine-growing regions church-bells were traditionally rung in the face of oncoming storms,〔("Hail cannons of France" ), 1905〕 later replaced by firing rockets or cannons.〔("Do cannons and rockets dispel hail storms?" ), 1909〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「A hail cannon is a pseudoscientific device and purported shock wave generator claimed to disrupt the formation of hailstones in the atmosphere. These devices frequently engender conflict between farmers and neighbors when used,("Residents Protest Hail Cannons" ) because they are repeatedly fired every 1 to 10 seconds while a storm is approaching and until it has passed through the area, yet there is no scientific evidence for their effectiveness.==Historical use==In the French wine-growing regions church-bells were traditionally rung in the face of oncoming storms,("Hail cannons of France" ), 1905 later replaced by firing rockets or cannons.("Do cannons and rockets dispel hail storms?" ), 1909」の詳細全文を読む
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