The original scan for this article appears at: http://chroniclingamerica.loc.gov/lccn/sn83030214/1907-06-17/ed-1/seq-5.pdf.
New-York Daily Tribune, June 17, 1907, page 5:
LETTERS TO THE EDITOR.
Progress Made by the Poulsen System in Overcoming Difficulties.
To the Editor of The Tribune.
Sir: Referring to an article on wireless telegraphy in your issue of June 6 which discusses the different obstacles which have to be overcome in order to open the way for regular transatlantic communication, it may be interesting to note the progress which has been made by the Poulsen system of wireless telegraphy in avoiding the difficulties naturally inherent to spark telegraphy.
The principal difficulties are the obtaining of accurate tuning, the overcoming of atmospheric disturbances and the variations of range with the time of day and night. Tuning with the old method of spark telegraphy cannot be guaranteed with greater exactness than about 5 per cent of the wave length on account of the dampening effect of the spark gap and oscillating circuit; with the Poulsen system, on the other hand, which generates undampened continuous waves, tuning is as accurate as can be determined with tho use of the present measuring instruments, and, to be specific, can be easily brought to within 0.5 per cent or less, which means practical non-interference of different messages.
With regard to the interference due to atmospheric disturbances and the variation in range with time of day and climatic conditions, I think the fact that for several months past continuous and trustworthy communication, by day and night and with all conditions of good and bad weather, has been established between the Poulsen radiotelegraph station at Cullercoats, North Shields, England, and the Danish stations of Esbjerg and Lyngby, near Copenhagen, should be sufficient evidence of permanent wireless communication. These towns represent distances of 350 and 560 miles, respectively. The practical success of the Poulsen invention under stress of the most severe examination by many of the foremost European experts has led to several governments giving extensive orders for this class of apparatus, and at this point I should like to mention that besides having overcome the above mentioned difficulties, this system possesses the great advantage of using a low, direct current of 400 to 500 volts, instead of 50,000 to 80,000 volts alternating current as used in spark telegraphy, which means that all possibility of danger to life has been eliminated. Furthermore, the absence of a spark makes the station noiseless--a great advantage when sending and receiving messages simultaneously. This latter has not only been accomplished, but the sending and receiving of several messages at one and the same time and on and with one antennæ has been demonstrated proving the practicability of multiplex wireless telegraph.
The company owning the rights to this invention has recently secured a license for the erection of a transatlantic station on the west coast of Ireland, and in view of the successful nature of the experiments carried on with small power and low masts there is every reason to believe that commercial communication will be shortly established between America and Europe.
New York, June 13, 1907. E. M. TRINKS.