Irradiated Milk: The Transmission and Antirachitic Activation of Milk Films by Ultra-Violet Radiations

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Abstract
EXPERIMENTAL Milk films of varied and known thickness were formed on a smooth verti- cal surface 40 × 56 cm. in area. The milk was allowed to flow from a hori- zontal slot which perforated the face of the supporting surface at the top. The width of the slot was such that the surface tension of the milk permitted complete closure of the slot irrespective of the rate of flow. Flowing films of uniform thickness and character could be formed over the area as desired. The thickness of the various milk films was determined by suitable cal- culations involving the quantity of milk delivered by a given area of film per unit of time, and the time required for the film to travel a given vertical

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