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Itory models, is applicable to large Venturi atomizers. The rough equivalence of measured and predicted values of D0 is consistent with the fact that the ratio of liquid to gas is intermediate between the two regions evident in Table X. ACKNOWLEDGMENTThis paper is based on work done for the Office of Scientific Research and Development under Contract OEMsr-102 with the University of Illinois. The investigation was suggested by H. F. Johnstone, director of the N.D.R.C. Munitions Development Laboratory, and by E. W. Comings, project supervisor, and was carried out under their direction. Part of the data on exhaust Venturis was obtained by the Solar Aircraft Company of San Diego, Calif. The graphs were prepared by . H. Roberts, research assistant in the Engineering Experiment Station.

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A method has been developed to measure thermal properties of a media from time-dependent temperature distributions. Data from a number of locations and times are used to construct polynomial approximations to the observed phenomenon. Derivatives appearing in the differential equation describing the temperature field are evaluated from the polynomials and are then used to determine the parameters in the equations. Two examples are included. The first is a measurement of the thermal diffusivity of copper. A simple experiment is shown to give results over a range of 100°C which agree with the literature to within 3%. The second is an investigation of the space dependence of the heat generation due to nuclear radiation in a metal cylinder placed in a reactor.