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DUNSTAN, “RICE, (KRAUS SPECTRAL LINES, (OF «SODIUM: 87 
Zeeman, on the basis of Lorentz’s theory, deduces that the 
change of the period of any vibrating molecule, divided by the 
ea e HT 
original period, that is should be equal to where e 
a ‘ m 47 
is the charge on the vibrating particle in electromagnetic measure, 
m is the mass of the same particle, H is the strength of the mag- 
netic field in C. G. S. units, T is the original period of the vibrating 
particle, and T’ the period when vibrating in the magnetic field H. 
e 
Inserting his observed values he finds that is of the order of 10" 
CG Sa cumitst m 
The writers have thought it worth while to attempt a verification 
of this result from the measures given in this paper. 
Let A be the wave length of the light emitted by some particle in 
the unbroadened line, then A+-(8, 
5 
8,) equals wave length of the 
light emitted by the same particle in the broadened line. 
From Lorentz’s formula 
Where v is the velocity of light. Then substituting in the formula 
above, o,—8 e, Hr 
Xr m 47Vv 
Expressing all quantities in C. G. S. units, 
A=5890 x 1073, §,—8, =.0895 X 107%. 
Fo7 34.3% Vises Beek ay 
This gives e 
Lay SLO 
mn 
If this number is assumed to represent the ratio between the 
number of electromagnetic units of electricity on a sodium atom 
and its mass, a rather interesting conclusion may be drawn as to 
the order of magnitude of the mass of this atom. For Mr. G. J. 
Stoney has calculated that for every chemical bond of a monovalent 
Substance ruptured a charge of 1o~®® coulomb is transferred, or in 
C. G. S. units ro-®!, and if it is further assumed that this is the 
charge upon a monovalent atom, it follows from inserting this value 
ys 
in the formula for that m equals .8x10—* grams. Using the 
m 
