170 P. E. Chase on Magnetic Inclination. 
magnetism, but I fear the attempt to reproduce, in any appreci 
able mechanical form, the magnificent and daily repeated oped 
tions in the laboratory of nature which I have feebly endeavored 
to interpret, must always be futile. In order to obtain even - 
earth’s center than the other. If the differences of vapor, tem- 
perature, barometric pressure, force and direction of wind, at- 
mospheric beapalegh &e., did not so complicate the problem as 
to discourage even the most sanguine experimenter from an 
attempt at olaien, any result that could be obtained under suc 
circumstances would give little ete satisfaction. 
It is possible, however, that the end, which we should vainly 
strive to reach directly, may be indirectly attained. Indeed, the 
various stages of an indirect road hay g been known, but we 
have not been able to compare them sey ae common measure. 
The motion of gravity, by percussion or the obstruction of sim- 
pe fall, has been repeatedly converted into the motion of heat; 
the motion of heat, by the thermo-electric pile, has been 
fou vertea into the motion of magnetism. The experiments of 
Barlow, Coulomb, Kupffer, and Christie,” on the influence of 
heat upon the magnet, furnish data that may lend some aid to 
any investigator who seeks to ascertain the precise ioe: and 
modification of each force, in these successive convers 
But I look most hopefully to researches that are aned 
differences of specific gravity. Even the experiments of Berlow 
and oth which J have just referred, as well as the electro- 
magnetic currents which are generated by chemical solution, 
involve such differences; the thermal aerial arene which har- 
monize with and increase the effects of simple gravitation 
ward the sun, are caused ie whic by the 2 tye centripetal 
» RXx(/D? a cal 00134 —1)=2°655. At os: the dail 
‘bance of total force eat as it 
tur should be eee I se 
that the igh ee is pets fides to the mo sates poser 
disturbances of the dking which a shift the other of force by a kind of conden 
_ polarit: rain. ere — vicki In ot important respects there is 4 
Btactory cor respondence between ne pore and St. Helena. * te 
Mean Mean Tide. (Theoretical X 3 xa. | 
. e Fall. on mee 
Theoretical, 8h. 29’ | —-00081 | San Sis 
a et oss Fee as .| 8h. 93! | —-00031 — 000180 
