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A
TREATISE ON
ELECTRICITY AND MAGNETISM MAXWELL
VOL.
I.
Uonfron
MACMILLAN AND
CO.
PUBLISHERS TO THE UNIVERSITY OF
Clarendon press Series
A TREATISE ON
ELECTRICITY AND
MAGNETISM
BY
JAMES CLERK MAXWELL, M.A LLD. EDIN., P.E.SS.
LONDON AND EDINBURGH
HONORARY FELLOW OF TRINITY COLLEGE, AND PROFESSOR OF EXPERIMENTAL PHYSICS IN THE UNIVERSITY OF
VOL.
CAMBRIDGE
I
AT THE CLARENDON PRESS 1873
[All rights reserved]
v,
Y\ ;
4/w>wa
.
Depti
I
PREFACE. THE
fact
appear to ancients.
that
certain
attract
In
bodies,
other bodies,
modern
after
being
rubbed,
was known
the
to
times, a great variety of other
phenomena have been observed, and have been found to be related to these
phenomena of
attraction.
They
have been classed under the name of Electric phe nomena, amber, ?i\eKTpov, having been the substance
which they were first described. Other bodies, particularly the loadstone, and pieces of iron and steel which have been subjected to certain
in
have also been long known to exhibit phe nomena of action at a distance. These phenomena, with others related to them, were found to differ from processes,
the electric phenomena, and have been classed under
the
name
of Magnetic phenomena, the loadstone,
/zayi^?,
being found in the Thessalian Magnesia. These two classes of phenomena have since been
found to be related to each oth