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Wireless Telegraphy n these may be mentioned Sir Oliver Lodge and Dr. Muirhead, Professor Fessenden, Professor Fleming, Dr. Valdemar Poulsen, and Mr. Lee de Forest. Owing to the success of the trials upon Salisbury Plain, Signor Marconi removed his field of further experiment to the Isle of Wight. During the latter part of the year 1897 he erected a mast 120 feet in height near the Needles. Then he took a tug and, fitting it with a mast 60 feet in height, put out from the Isle of Wight, running a course towards Bourne- mouth on the mainland. As the tug moved forward the transmission of signals from the Needles station commenced. The object of this investigation was to determine how far from the Needles the signals dis- patched from that station might be picked up, the great ambition being to link the island with the mainland by wireless.. Progress was slow, although Marconi and his assistants toiled day in and. day out, irrespective of weather. Slowly but surely the little vessel crept farther and farther away from the Needles. Suddenly there would be a pause. The signals which had been coming regularly ceased without warning. Thereupon the instruments within the tug were adjusted, and improved details made here and there. Once again the signals rolled in, and again the tug moved ahead, continuing its snail-like passage until another break- down in the receipt of the signals came, when the vessel was eased up and further improvements effected. The work was tedious, while tossing about in a small tug upon the rough bosom of the Channel during the blusterous and cold winter months was by no means envious. The weeks slipped by, too rapidly for the