THE 



AMER1CANJ0URNAL0FSCIENCE 



[F OURTH SERIES.] 



Art. XLI. — Experiments on the Reception hy Wires of 

 Electric Waves; by 0. A. Chaint. 



The present paper contains an account of experiments on : 

 (1) the nature of the disturbance about the receiving antenna 

 in the system of wireless telegraphy devised by Braun and 

 Siemens and Halske ; (2) the radiation from the Braun, Slaby- 

 Arco and simple Marconi forms of transmitters, observed by 

 the method of resonance ; (3) the effect on resonance of insert- 

 ing a coherer in an open wire ; (4) an exploration of wires 

 receiving the radiation from a simple Marconi transmitter ; 

 and (5) a repetition of some of Slaby's fundamental experi- 

 ments. 



The paper may be considered as a continuation of a former 

 one* dealing with the transmitting antenna in wireless tele- 

 graphy. 



A number of investigations have been made on wires 

 arranged as in wireless telegraphy for the reception of electric 

 waves, but in almost every instance these have been restricted 

 to observing a maximum effect at one place, — the base of the 

 antenna, — and as detectors the spark gap, the hot-wire ammeter 

 and the hot-wire thermometer have generally been used. 



In my experiments the nature of the oscillatory disturbances 

 was determined by means of the magnetic detector, used in 

 the manner fully described in the former paper, and the explo- 

 ration extended from one end of the wire to the other. 



The wires, both for transmitting and for receiving the waves, 

 were of bare copper, 0'7 mm in diameter, stretched horizontally 

 on the top of wooden posts, about l*5 m above the floor of the 



* C. A. Chant, The Variation of Potential along the Transmitting Antenna 

 in Wireless Telegraphy, this Journal (4), vol. xvii, p. 1, 1904. Phil. Mag., 

 (6), vol. vii, p. 124, 1904. 



Am. Jour. Sci. — Fourth Series, Vol. XVI1T, No. 108. — December, 1904. 

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