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<br />4 <br /> <br />. <br /> <br />ice, in Tasmania)an'l Pierre St. Amano(using silver iolide)have also :Jane <br /> <br />clear air see:Hng eXDeriments. We hone to exten'j their results, make more <br /> <br />refined measurements. an'i ge!.~ better idea of how effective_ clear air see:Hng <br /> <br />would be if it were nossible to :Jo it on an, one rational basis. This winter <br /> <br />we will be trying to fin! an effective ice nucleant for low temnerature, low <br /> <br />sU"ersaturation environments. Dry ice (or even liquid carbon :Jioxi-:ehs quite <br /> <br />effective. but difficult to disT'erse. So we 1"lan to look at silver io!j'~ <In' <br /> <br />if time T'ermits. T'erhans some9ther agents. <br /> <br />Why is a New Y'ork groun onerating in Colora io? W" are o~erating in <br /> <br />Colora:Jo because the regular T'ilot for the Schw~zer, Bill Bullock. lives in <br /> <br /> <br />ColoraJo Snrings. In a:ldition. the nroject iJ';, sun..:'orted by_the Office of Naval <br /> <br /> <br />Research and the Schweizer is owned by the Office of Naval Research. This <br /> <br />allows us heate'l hangar snace at Peterson Air Force Base. in Coloraco Svrings. <br /> <br />Our exneriment is quite weather-de1"en'lent. We antic irate 1"ro".<?L.con:iition~_on <br /> <br />nerha"s one in four to seven days. By onerating out of Colora,jo Snrings. Bill <br /> <br />can carryon his normal activities on the major ity of the ::ays _ because con:iitions <br /> <br />will not be right for clear air see:Jing. This is both convenient for Hill and <br /> <br />less exnensive for the State University of Now Y'ork(actually, the Office of <br /> <br />Naval Research). Generally-.~e,_e:>>,.,ect .t_h,esame fJ:eClllency of 9".~ortunity For <br /> <br />clear air seeding over Coloralo as over any other T'art of the continental Unite:! <br />, - ,------- ,-- --- - - -, <br /> <br />States. <br /> <br />Our exneriments are very small-scale. I have seen aircraft traffic over <br /> <br />the Front Range in the Colorano Snrings area nroJuce many miles of T'ersistent <br /> <br />contrails throughout days when conditions are favorable. If we are successful we <br />