Scheme suggested comprises combination of radio directive transmission system to guide aircraft at high speed in direct course between separated cities or other points, audio frequency signal means to project audio frequency energy to predetermined altitudes, but restricted to area of landing field, and indirectly illuminated zone in center of landing field.
Finding aircraft landing stations by means of audio frequency receivers
Flying
Flying ; 8 , n 5
1919
2 pages
6 Figs.
Aufsatz (Zeitschrift)
Englisch
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