ART. I.-Remarks on the Influence of Magnetism on the Rates of Chronometers. By GEoRGE HARVEY, M.G.S., M.A.S., &c. &c. * Communicated by the Author.
THE interest that has been latterly displayed respecting the
influence of Magnetism on Chronometers, may plead an apology
for the following contribution. Such, indeed, is the importance
of the subject to the naval and commercial interests of the coun-
try, that every attempt to illustrate the effects of permanent and
induced magnetism on those delicate machines, may be regarded
as useful; since it is only from the accumulation of diversified
experimental results, that we can hope fully to comprehend the
real nature of the errors produced by this active and powerful
The following experiments, part of an extensive course on the
Influence of Permanent and Induced Magnetism on the rates
of Chronometers, were undertaken principally with a view of
ascertaining the effects which the former influence would have
on their main springs, in consequence of its having been sus-
Pected, during the prosecution of some analogous inquiries, that
the rate was subject to considerable fluctuations, according to
the positions occupied by this part of the machine, with respect
"An account of a remarkable case of Magnetic Intensity of a Chronometer, ** Harvey, will be found in the Transactions of the Royal Society of Edinburgh, ** Part l. now in the press—Ep.
VOL. X, No. 19. JAN, 1824. A.