18 



gas in the outflow. In the instrument described in the text, a bulbous enlargement of the 

 lower portion of the meter chamber is provided in order to reduce the velocity of outflow and 

 so minimize the downward convection of any minute bubbles which may have persisted in the 

 outflow. 



The property of the instrument indicated above suggests the possibility of discrimina- 

 ting between dissolved and undissolved gas in the inflow if this were desirable. This could 

 be effected, for example, by simultaneous operation of two meter chambers in one of which 

 the mixing efficiency is maintained purposely at some known low value. 



REFERENCES 



1. Bowers, W.H., "The 12-Inch Variable Pressure Water Tunnel Propeller Testing Pro- 

 cedure," David Taylor Model Basin Report 505 (November 1943). 



2. Borden, A., "Design, Operation, and Maintenance of a Meter for Recording the Air Con- 

 tent of Water in the David Taylor Model Basin Water Tunnels," David Taylor Model Basin 

 Report 549 (December 1946). 



3. Crump, S.F., "Determination of Critical Pressures for the Inception of Cavitation in 

 Fresh and Sea Water as Influenced by Air Content of the Water," David Taylor Model Basin 

 Report 575 (October 1949). 



4. Griffin, R.C., "Technical Methods of Analysis, "McGraw-Hill (1927), p. 703. 



5. Van Slyke, D.D., and Neil, J.M. "The Determination of Gases in Blood and Other 

 Solutions," Journal of Biological Chemistry, Vol. 61 (1924), p. 523. 



6. Glasstone, Samuel, "Textbook of Physical Chemistry," Second Edition, D. Van Nos- 

 trand Co., New York (1946), pp. 693-703. 



7. "Handbook of Chemistry and Physics," Twenty-Seventh Edition, Chemical Rubber 

 Publishing Co., Cleveland, Ohio, pp. 1328-29. 



8. Sherwood, Thomas K. and Pigford, Robert L., "Absorption and Extraction," Second 

 Edition, McGraw-Hill (1952). 



9. Bush, Vannevar, "Operational Circuit Analysis," J. Wiley and Sons (1937). 



10. Prandtl, Ludwig, "Essentials of Fluid Dynamics," Ilafner Publishing Co. New York 

 (1952), p 400. 



11. Dukler, A.E., and Bergelin, O.P., "Characteristics of Flow in Falling Liquid Films," 

 Chemical Engineering Progress 48 (November 1952). 



