1. See Petterssen, S., , , Introduction to meteorology, , p. 40 , McGraw-Hill Co., , 1941, .
2. See Petterssen, S., , , Introduction to meteorology, , p. 40 , McGraw-Hill Co., , 1941, .
3. Hesse, V. F., , Cilian, O'Brolchain, , Beitr. Geophys., 37, 386 1932,
4. Wigand, A., , Annal. Hydrograph., 58, 213 1930,
5. Parkinson, W. C., , , see G. R., Wait, , , Carnegie Inst. Washington, , (Yearbook No. 28) , 274 ( 1928, /29 ).