This paper presents a non-technical survey of the research being done on the meteorological aspects of aircraft icing. The organization of the program and functions of four installations in the U. S. are indicated. After a short qualitative discussion of the flow around cylinders, several new specialized instruments are described, and some of the theory developed to interpret their data is treated briefly.
* Published with permission of the War Department. Mr. V. J. Schaefer of the General Electric Co. has kindly checked the references to Dr. Langmuir's and his own work.