Dipole antenna other monopole) antennas on the basis of dipole antennas of which they are one half. German physicist Heinrich Hertz first demonstrated the existence of radio waves in 1887 using what we now know as a dipole antenna (with capacitative end-loading). On the other hand, Guglielmo Marconi empirically found that he could just ground the transmitter (or one side of a transmission line, if used) dispensing with one half of the antenna, thus realizing the "vertical" or monopole antenna. For the low frequencies Marconi employed to achieve long-distance communications, this form was more practical; when radio moved to higher frequencies (especially
Long Distance Wireless Photography Long Distance Wireless Photography La Photographie électrique à distance, released in the United States as Long Distance Wireless Photography and in Britain as Electrical Photographer, is a 1908 French short silent comedy film directed by Georges Méliès. In a glass-roofed workshop, an inventor is surrounded by mechanical devices for a complicated machine. The inventor's servants show in a respectably dressed lady and gentleman; the inventor welcomes them in and begins to demonstrate his invention to them. Setting the machine in motion, he unrolls a large screen and places a small image of the Three Graces on a chair; thanks to