The most interesting feature of the Eiffel Tower wireless station is its aerial and before I left I studied it carefully. It is a one-sided affair, but this is not because its designer thought well of it but in virtue of the fact that the Eiffel Tower sets at one end of the Champ de Mars. If the tower had been built in the middle of the park the wires could have been brought down all around it on all sides thus forming what is called an _umbrella aerial_ and this would have been _good practise_, as the engineers say. As it is there are six steel cables about ½ an inch in diameter secured to but insulated from the top of the tower on one side and these are guyed out in the shape of a fan and anchored at the other end of the park. The cables are set in stone posts which project above the ground and to prevent simple folks from laying their hands on them, in which case their bodies would become conductors and allow a few million volts of high potential electricity to pass through them, the posts are surrounded by iron fences. The main cables are connected together about half-way between the ground and the top of the tower with other and lighter cables and these are joined to a single leading-in cable which runs down to and passes through a window to the top of the area-way in the underground building. Finally the leading-in cable is connected to one end of a tuning coil, the other end of which is joined to a _ground_ formed of metal plates having nearly 3000 square feet of surface and these are buried deeply in the earth far below the underground building. Before I left the States to get the Eiffel Tower station the Navy Department had contracted with the _National Signaling Company_, an American wireless telegraph concern, for the most powerful cableless plant that had yet been built. While I was in France work had been started on the towers and buildings at Arlington on the Potomac River near Washington and the machinery and apparatus for it was being built. After my return, with some jockeying, I landed a position with the _National Signaling Company_ in the testing department and so had the opportunity of watching the whole installation grow up of which I shall tell you presently. Finally when every piece of apparatus had been built and given exhaustive tests the equipment was shipped to Arlington, or, as some would-be high-brow tried to rename it, Radio, and the engineers and working force of the Company were sent to Arlington to install it, get it into working order and make the final tests required by the Government before the latter took it over.