The Birmingham age-herald., 1907-07-07

15 to SO per cent the power used to operate trains Is lost in the sidewise, swinging mtoion of cars. The Tunis mono-rail trains, 1t Is declared, have a straight head motion, without any side swing.
 Nothing which ever moved on wheels can equal the speed claimed for the Tunis ''mono-raiP' trains One hundred miles an hour is an easy matter, and the cars can be pushed up to 150 miles without any difficulty. And, while the cars are going at this speed, 1t is claimed that tho motion is so gentle that passengers are ba: :ely aware of the fact that they are moving. The jerky. swinging motion of two-rail trains Is declared to be en- tirely absent.
 It Is the cheapness of the cost of the system, which, if 1t is what is claimed for it, threatens to revolutionize rail- road construction.
 According to the estimates made for the New York packers of the project, a four-track elevated line, such as 1t Is proposed to build between Jersey City and Newark can be constructed for S5,- 600 per mile. To build four-track ele- vated road. similar to the present ele- vated system in this city. would cost 1900 600 per mile. This does not include the cost of power or equlpment-only the structure and tracks.
 Following the news of the successful experiment with the Tunis mono-rail sys- tenn, comes the announcement from Dr. Lee De Forrest the inventor of wire less telegraph system, that the day of the wireless telephone Is near. In fact, Dr. Dc Forrest declares that he is now able to talk from New York across the Hudson river to the Jersey shore. In de- scribing his system the inventor said:
 'Eitker waves are used for the trans mission of wireless telephony just as in wireless telegraphy. The present form of wireless telegraphy is that if vibra- tio.i arising from spark flashing across the air, and these open and close a receiver which makes the sounds of the Morse alphabet in the telephone
 "In the same way l generate a con- tinuous succession of electric waves, which are utilized In transit to carry the sound of the human voice. When you speak into the receiver of the wireless tele- ph one your voice changes the resistance and part of the current goes into the earth and part into the air. carried up by two wires which are elevated about 100 to 15O feet abovs the building and the two currents then form a complete cir- cult.
 'I think that the wireless telephone will be invaluable for small vessels, mines, lonely ranches, and lighthouse keepers For the navy also in man. oeuvres or in battle 1t will be of inesti- mable service. An installation could be fitted in the chart room of all our war ships, and commanders could talk d- rectly to each other. There would then be no danger that an order had been misinterpreted in passing through other hands So highly did Admiral Cowles, chief of the bureau of equipment in Washington think of 1t that he told one of my directors that he wished we were ready to deliver fifteen at once to the nav.
 Just to show the immense possibili- ties of wireless telephony, I may men, ton that while I was experimenting with the wireless transmission of music last March from the Philharmonic hall at Thirty-ninth street, to the Hotelt Nor mandie on Thirty-sixth street, the wire less operator at the Brooklyn navy yard four miles distant, heard on his instru- ment the overture to William Tell fol- lowed by Gounod's Ave Maria
 'I arr positive that even now I could talk with Sandy Hook, and if we go on at the same rate of progression, in five years or less whe shall be able to pro- iec. lhe voice 500 miles. and by the same