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<br />Mike Eggers lid <br /> <br />Phone: 64-3-5432350 Flaxmore Road, R.D.2, <br />Fax: 64-3-5432338 Upper Moutere, <br />Nelson, <br />New Zealand. <br /> <br />COPYRIGHT 1994 CO <br /> <br />THE THEORIES OF HAIL SUPPRESSION <br />BY THE USE OF CANNONS <br /> <br />------------ <br />,n -- -- . - -1'here-are- two-basiciheorie-s-betn~rofTeFecf onnow the AntT Hail Device, commonly <br />called a "Hail Cannon', act to prevent hail posing a threat to perishable crops or <br />property. <br /> <br />"IONISATION" <br /> <br />This theory suggests that the potential hail bearing cloud is electrically charged with <br />negative "Ions", while the ground has a positive charge. Somehow, the cannon is <br />credited with causing the cloud to dispatch its electrical charge towards the ground in <br />the form of lightening, The process then claims to "deprive the cloud of its capacity to <br />produce hailstone nuclei'. 'Thus the cannon is able to prevent the formation of large <br />hailstones by removing the conditions necessary for their growth." <br /> <br />This is far too compleJran argument for us to understand, so we will leave it to the <br />promoters of this theory to explain it. <br /> <br />Over a substantial period of study. we were unable to find any credible evidence to <br />support this theory. This is not to say that the theory is wrong, but rather that 'we' do <br />not subscribe to itl <br /> <br />"CAVITATION" <br /> <br />We have developed this theory after working backwards from the reported 'effect', as <br />reported by those operators of cannons in the field, to find a 'cause" of that effect, <br /> <br />Reported 'success' of hail cannon operation always included the statement that 'no <br />hail fell, but we did have slushy or mushy icy splats', or that "the hail was slushy and <br />harmless'l <br />