Stock Photo - Hail cannon is seen in Svincany, near Pardubice, Czech Republic, on September 12, 2017. Czech orchardist Jaroslav Nevole is defending his orchards against bad weather by the hail cannon. The shock wave from the cannon smoothes the hail to snow or rain. The cannon is a large green container with a funnel chimney. Impact waves produce with acetylene, which is in pressure bottles. The air blows acetylene into the combustion chamber in the chimney, the electric spark then launch the cannon. (CTK Photo/Josef Vostarek)

Stock Photo: Hail cannon is seen in Svincany, near Pardubice, Czech Republic, on September 12, 2017. Czech orchardist Jaroslav Nevole is defending his orchards against bad.

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