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<br />1, You are endeavouring to tamper with mother nature, and therefore not only inviting <br />complaints from seemingly 'disenfranchised" people by claiming that you can <br />"make it rain' in an area where it would otherwise not! Litigation would be a "piece <br />of cake'l1 <br /> <br />2, We have been unable to convince any of our prospective clients to accept 'maybe <br />two smaller hailstones, rather than one big one' as being problem solvingl <br /> <br />Hail by any other "size' is still Hail. This was clearly not an option to offer to our <br />clients. <br /> <br />3. The idea of making it rain prematurely, suggests that you will deprive the protected <br />area of 'precipitation'. It is just possible that this area could benefit from the rain, <br /> <br />4, The operation Involved in 'seeding' is one of great complexity and expense. It <br />reqUires operators with a very high degree of skill in meteorology and expensive <br />equipment available at a moments notice, The co_s.!.?i1.9.I2.1:~cticali!lel>_Qltbls____ _" <br />'---. - -,- ---S}TSlemlsveryClearlyoeyoncftne resources of the Farmer or Business, <br /> <br />BACK TO HAIL CANNONS <br /> <br />Our search of the available data on Hail formation eventually lead us to a study by <br />Charles and Nancy Knight, April 1971. Published by Aldus Books London, in the <br />'Aldus Science and Technology Series'. This study reveals the formation process as <br />one whereby the growth of a hailstone follows the following pattem, <br /> <br />Within the cloud formation, the freezing of the super cooled water is started by certain <br />kinds of dust or salt particles, or by collision with an already formed ice particle or snow <br />crystal that is floating around within the cloud. 'Hailstones grow by sweeping up <br />supercooled drops that have not been frozen.' No doubt they also sweep up <br />occasional ice particles, but this is certainly a minor mechanism of growth. When a <br />supercooled drop strikes an ice surface, two things happen: the drop spreads out on <br />the surface, and it freezes. If it freezes quickly, it will not have time to spread much <br />before it is entirely solid, and it will remain a rounded lump of ice on the surface of the <br />stone. If it freezes slowly, it may have time to spread into a thin layer, There are all <br />possible graduations between these extremes, <br /> <br />The freezing of supercooled droplets colliding with a hailstone liberates heat. As a <br />supercooled droplet freezes its temperature rises to Zero degrees C. Only when all the <br />water in the droplet freezes can the temperature again fall below Zero. If the average <br />interval of time between the collisions at a given point on a growing hailstone is smaller <br />than the time taken for one drop to freeze completely, that point will remain at zero <br />degrees C throughout the growing process. Moreover the hailstone will include some <br />liquid water from the unfrozen portion of the drops, The amount will depend on the <br />ratio between the collision rate and the rate of heat loss, Hailstones that include a <br />substantial amount of liquid water for this reason are called spongy. They will be <br />observed to splash rather than bounce when they strike the ground. If on the other <br /> <br />3 <br /> <br />Copyright @ 1994 <br />