314. P. EH. Chase on the relations of Gravity and Magnetism. 
II. Marked indications of an accelerating force are discover- 
able in the magnetic fluctuations, especially during the hours 
when the sun is above the horizon. 
Th. 2h 3h. 
Hours from Mean, - = - - ; 
Mean Ratios of Hourly Tidal Differences, - 100 73 27 
- “« — Squares of Hourly Mag- 
netic Differences, - 100 74 26 
See also Thesis V. ‘ 
III. There are lunar-monthly barometric and magnetic tides, 
which may be explained by differences of weight or momentum,” 
occasioned by the combined influences of solar and lunar attrac: 
tion, and terrestrial rotation. 
IV. The solar diurnal variations of magnetism between noon 
and midnight are nearly identical in amount with the variations 
of weight produced by solar attraction at the same hours. 
The ratio of the solar to the terrestrial attraction for any pal 
ticle at the earth’s surface, being directly as the mass, and inverse 
ly as the square of the distance (M+R? =354,936+ 28,000*), 1s 
_ 00067. The weight of any particle is therefore increased by 
this proportionate amount at midnight, and diminished in the 
to my theory, in the terrestrial magnetism. 
Theoretical variation, 00134. Observed variation, ‘00138. 
V. The magnetic variations at intermediate hours, between 
noon and midnight, indicate the influences of an accelerating 
force, like that of gravity, modified by fluctuations of temper 
ture, and by atmospheric or etherial currents. : 
Every particle of air may be regarded as a planet revolving 
about the sun, in an orbit that is disturbed by terrestrial attrac- 
tion and other causes. In consequence of these distur ances, 
there is an alternate half-daily fall toward the sun, and rise from 
the sun. By the laws of uniformly accelerated and retarde 
; etic dis- 
Theoretical mean, 8 29’. Observed mean, 8" 31’. ted 
VI. Some of the magnetic influences appear to be transmis®” 
instantaneously, through the rapid pulsations of the ae 
ether; others gradually, through the comparatively slugg! 
vibrations of the air. a 
II. The comparative barometric disturbances of the sun 4? 
moon exhibit an approximate mean proportionali 
their comparative differential-tidal and magnetic disturbances. i 
the solar differential-tidal force be represented by A’, a0 
_™ I believe there can be no weight without some degree of momentum, See 
Proc. A. P. 8. ix, 357. 
