THE 
EDINBURGH 
PHILOSOPHICAL JOURNAL. 
Art. l.'^Remarhs on the Injluence (^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 
agent. 
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, 
by Mr Harvey, will be found in the Transactions of the Royal Society of Edinburghf 
vol. X. part 1. now in the press. — Ed. 
VOL. X. NO. 19 . .TAN. 18 ^ 4 . 
A 
