ULTRA-SHORT-WAVE TRANSMISSION PHENOMENA 



373 



could be maintained at all times, transmitting from Sea Bright on 4.6 

 or 1.58 meters and receiving on the plane's regular service wave. 

 Contact of this kind is well nigh indispensable. 



From September 25, 1933 to November 20, 1933, inclusive, fourteen 

 airplane runs were made, ten of which were recording trips. Measure- 

 ments were made both " go " and " return," and of the twenty obser- 

 vations resulting, three were made at 8000 feet, four at 2500 feet, two 



50 



Fi£ 



10 20 30 40 50 60 70 80 90 lOO 110 120 130 



MILES FROM TRANSMITTER 



3 — Flight from transmitter. Wave-length — 4.6 meters; Altitude — 8000 feet; 

 October 3, 1933; 10:20 a.m. to 11:35 a.m. 



at 2000 feet, and the remainder, or eleven, at 1000 feet. No observa- 

 tions at 2000 feet had been scheduled but on September 28, when 

 a 2500-foot run was begun, clouds forced a drop to 2000 feet. 

 Each round trip lasted from two to five hours and due to the exi- 

 gencies of airplane operation was completed between 9 a.m. and 5 

 p.m. In Figs. 2 to 12 inclusive, a set of typical observations is plotted. 

 Superposed on the observational curves are theoretical curves cal- 



