Abstract: An artificial snow making apparatus has a vertical inner cylinder, an outer tank around said inner cylinder, an air velocity adjusting duct connected between the top and an intermediate portion of the inner cylinder for causing air to flow therethrough from the top of the inner cylinder and to flow upwardly in the inner cylinder. The duct has a fan therein for adjusting the velocity of the air flowing therethrough for thereby adjusting the velocity of the air flowing in the inner cylinder. A cloud making machine and a seeding device are connected directly to the vertical inner cylinder at positions between the top and the intermediate portion. A cooling unit is provided for cooling air in the outer tank, thereby cooling the inner cylinder. A blower apparatus draws air from the outer tank, adjusts the temperature to the temperature of the air inside the inner cylinder and directs it downwardly into the inner cylinder below the intermediate portion.

Abstract: A televising apparatus is provided in a chamber of a snowfall testing system in which various testing conditions may be varied which effect the characteristics of particles of snow generated in the chamber. The televising apparatus has a television camera with an object lens for televising the particles of snow falling in the chamber, and a film feeder for feeding a transparent film, onto which the particles fall, past the object lens. A television camera transfer unit moves the television camera and object lens relative to the transparent film such that the particles falling thereon may be properly and fully televised. Furthermore, a focus regulator is used to move the film feeder and film relative to (toward and away) from the object lens so that the particles falling on the film may be focused. By televising the particles, results of the testing conditions are obtained which can be used to determine the effects of the testing conditions in generating snow within the chamber.

Abstract: An optical deterioration-accelerating weather and optical resistance testing device has a light source and a frame supporting a sample to be tested rotating around the light source. Thermal deterioration of the sample due to radiant heat generated by the light source is inhibited by the provision of a cold air guide enclosing a portion of the sample rotating frame on which the sample is supported. Cold air is introduced to the surfaces of the sample through the cold air guide to maintain the both sides of the sample at a constant test temperature.

Abstract: A snow generating and snowfall apparatus has a snowfall chamber having in a top wall thereof an opening, a vertically extending cooling tower having the bottom mounted on the top wall and surrounding the opening, a air first cooler connected to the tower for cooling the air in the tower, an inner cylinder positioned in the cooling tower and extending in the lengthwise direction thereof and having a bottom end opening connected to the opening in the top wall, a circulating passage connecting the top end of the inner cylinder and a lower end portion thereof to each other, a variable speed blower in an intermediate portion of the circulating passage, a humidifier connected to the lower portion of the inner cylinder for feeding water vapor into the inner cylinder in the vicinity of the lower end thereof, and a snow generating material feeder connected to the inner cylinder in the vicinity of the humidifer for feeding a snow-generating material consisting of ice crystals into the inner cylinder.