In 1907, the Italian Royal Academy of Sciences noted tests showed anti-hail cannons weren’t effective and urged the government to cease encouraging expensive and useless work. By the early 20th century, anti-hail cannons disappeared. Replacing them were anti-hail rockets that would explode 800 grams of dynamite, above the ground, to prevent hail formation. These explosions broke up the cold core eddies that develop hail. In 1972, the Corballan company of France marketed a new version of the hail cannon and remains the largest manufacturer of the devices. The new cannons substitute acetylene for black powder, automatically load and reload and are fired from remote locations. Fastcast: More showers.
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