Radio in 1913

Radio Record, Volume III, Issue 35, 14 March 1930, Page 32

Radio in 1913

ae ee ee "Telephony without Wires" A VERY interesting clipping from a magazine, dated June, 1913, has been forwarded to us by a correspondent. The article, which incidentally is headed "Telephony . without Wires," discusses the possibilities. of wireless telephony over moderate distances, and gives a brief account of some experiments conducted along’ these lines. After reading this article, it is amazing to think that only thirteen years ago people considered the maintaining of a conyersation by radio over a distance of a mere twenty-five miles, a marvellous achievement. What a contrast to the recent two-way radio telephony tests between New York and Sydney! The article in question is given below :- ON i of the most remarkable experiments in the science of voice reproduction yet made has recently been brought to public notice by Mr. H. Grindell Matthews, the young inventor of the aerophone system of wireless telephony. Mr. Matthews stationed himself in a closed strongroom in a large puildé ing. The walls of the strong-room corte sisted of nine inches of armour steel, nine inches of fire brick, and six feet of concrete, but, notwithstanding this, Mr. Matthews easily carried on con- versation with another operator in a room at the other end of the building! At the time of writing he proposes to carry out another test of his apparatus by an endeavour to talk through five miles of rock, between Chepstow and Tintern. By means of man-lifting kites, Mr. Matthews hopes to raise his receiving aerials sufficiently high to enable him to carry a conversation between Chepstow and Cardiff, a distance of over twenty-five milesf Mr. Matthews explains that "the vibrations produced * by his electrical apparatus are not in the form of Hertzian waves, like Marconi’s wireless telegraphy, but that the discharges are of such frequency that there are no appreciable breaks between."