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.