21. In 1930 comes to air radio TGW, the Voice Guatemala, first station of long wave . 22. Early commercial and professional radio services relied exclusively on long wave , low frequencies and ground-wave propagation. 23. The long wave infrared cameras used in military applications such as giving fighter pilots night vision. 24. The day capped a week-long wave of violence. 25. His work has produced a new interest in the theory of long waves in economic development. 26. The long wave transmitter was modernized and the main antenna tower received a new cage aerial. 27. In general, shorter waves have an eastward group velocity and long waves a westward group velocity. 28. Green's law also corresponds to constancy of the mean horizontal wave energy flux for long waves : 29. Had a quick google but could not find any long wave images in the public domain. 30. Models, who have long waved the goddess flag, are being held to much less rigorous standards today.
