PROCEEDINGS. 
427 
gist as well as to the hydrographer. He proposes to anchor a 
hollow vessel at some distance below the surface of the sea, con¬ 
taining a registering pressure-gauge on which the superincumbent 
column of water acts. He discussed various forms of gauges and 
the practical conditions of the experiment. [Not published.] 
Messrs. Marvin, Harris, Wead, and Shidy discussed the 
paper. 
583d Meeting. March 26, 1904. 
President Marvin in the chair. 
Twenty-eight persons present. 
The election and qualification of Messrs. W. H. Whitton, 
H. H. Bates, C. E. Duvall, G. K. Burgess, K. L. Guthe, H. C. 
Dickinson, F. E. Fowle, F. A. Wolff, Jr., P. G. Nutting, 
N. E. Dorsey, L. G. Hoxton, and 0. B. French were an¬ 
nounced. 
Mr. L. A. Bauer exhibited informally magnetograph records, 
showing slight earthquake-shocks on March 16 and 21, 1904. 
The subject was discussed by Messrs. Marvin and Abbe. 
Mr. Bergen Davis, of New York, presented, by invitation. 
The theory of the electrodeless discharge. A receiver containing 
gas is placed in the field of a coil through which an alternating 
current passes; when the field reaches a certain potential there 
is a white discharge through the gas; this potential was deter¬ 
mined as a function of the gas-density and alternation-frequency. 
The results were found to be in close accordance with the theory 
of electrons. [Published in the Physical Keview, vol. xvii, p. 501 
(1903).] 
Mr. P. G. Nutting then spoke on The dynamics of a moving 
charge, presenting systematically the dynamical principles that 
underlie the theory of electrons, and pointing out, among other 
things, the great differences in the nature of the fields produced 
by electrical charges moving at different velocities. [Not pub¬ 
lished.] 
The two papers were discussed by Messrs. Thompson, Briggs, 
and Bauer. 
