Additions to membership, 36. After the transaction of the usual Institute business a joint meeting was held with the Philadelphia Section of the American Institute of Electrical Engineers, Vice-President Sellers and Chairman Hornor presiding jointly.
Vice-President Sellers introduced Dr. G. W. Pierce, Assistant Professor of Physics, Harvard University, who spoke on " The Wireless Telephone."
Dr. Pierce first reviewed the methods 04 producing high-frequency electric oscillations by the singing-arc, the quenched-spark and the highfrequency generator, illustrating his remarks by lantern slides and by demonstrations of the first and second of these methods.
By means of schematic diagrams, he explained how such oscillations produced the continuous train of magnetic waves necessary for wireless telepho~ay.
He stated that the chief advantage of wireless telephony over telegraphy was that less trouble was experi,enced from atmospheric and other interferences, since words could be interpreted more easily than signals, even if only a few syllables of such words were audible.
Dr. Pierce stated that wireless telephony had already been successful over a distance of 35 miles.
After a vote of thanks to the speaker, the meeting adjourned. R. B. OWENS,