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<br />. <br /> <br />14 <br /> <br />. <br /> <br />may be in doubt. These two problems reduce, to some extent, the reliability <br />and usefulness of this data set. <br /> <br />. <br /> <br />Fukuta, Neubauer and Erickson (979) <br /> <br /> <br />Ice crystals grew inside a L - shaped tunnel that was contructed of <br /> <br /> <br />Masonite. The tunnel, with a 0.5m square cross section, has a height of 2.0 m <br /> <br /> <br />and a horizontal length of 2.5 m. Air flowed through the tunnel by means of <br /> <br /> <br />a vacuum cleaner attached to the top end of the tunnel. The cold air entered <br /> <br /> <br />into the tunnel through a filter on the top side of the horizontal section at the <br /> <br /> <br />farthest end from the vertical section. After entering into the tunnel. the air <br /> <br /> <br />then mixed with steam produced in a pressure cooker heated on a hot plate. <br /> <br /> <br />The steam entered through evenly spaced nozzles that were connected to the <br /> <br /> <br />end wall of the horizontal section next to the cold air entrance. The fog then <br /> <br /> <br />flowed to the opposite end of the horizontal section before turning upward <br /> <br /> <br />into the vertical section. At the exit of the horizontal section and the <br /> <br /> <br />entrance to the vertical section, the fog passed through honeycombs that were <br /> <br /> <br />made of drinking straws in order to suppress turbulence and create a laminar <br /> <br /> <br />flow. The fog finally reached the top where an air filter was mounted just <br /> <br /> <br />under the tube of the vacuum cleaner. <br /> <br /> <br />Observation holes along the tunnel walls in the horizontal and vertical <br /> <br /> <br />sections provided access for monitoring the temperature and the liquid water <br /> <br /> <br />content and for seeding the fog. Thermometers measured the temperature <br /> <br /> <br />and a plaster of paris method furnished the means for determining the liquid <br /> <br /> <br />water content. This method of measuring the liquid water content required a <br /> <br /> <br />V-shaped tube that was filled with hardened plaster of paris that was crushed <br /> <br /> <br />to the size of rice grains and pretreated with saturated air to avoid water <br /> <br />vapor absorption during contact with the fog. As a known volume of the fog <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />