Abstract
A cloud chamber for investigating the ice-forming properties of natural and artificial aerosols consisting of three adjacent compartments is described. Each compartment is a mixing-type cloud chamber, each held at a different preselected temperature. The sample to be examined is introduced simultaneously into all compartments and the crystals which form in the compartments, are recorded in a sugar solution. The temperature distribution in the compartments and the composition of the sugar solution are detailed. The connection between the temperature of the sugar solution for melting and growing of ice crystals and for self-crystalisation of the sugar solution and the concentration of the sugar solution is discussed. The measuring procedure is outlined and examples of counts of freezing nuclei in Dublin air are given.
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