New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1899-03-19

lyst 10y outsiders from whom he secured con-
siderable revenue; and he was invited to lecture
before colleges and army schools. Some Of the
profTered engagements he declined He would
not sever his connection with the Royal Insti-
tuition. allow himself to be diverted from
the quest on which he had entered
So strongly convinced Faraday Of the
correlation OF forces that he was confident that
II electricity would produce magnetism the con-
verse was also true. He had studied the prob
lem long and eagerly. but ii was only in 1881,
Mt the end Of a fresh season Of experiment, last
ing ten days that he hit upon the secret He
then found that ne could excite current in
copper wire If he moved the latter in front Of
magnet in such way as to cut the imaginary
Zines Of force" that proceed from the magnetic
poles The principle here called into play under
lies the modern dynamo. by which electricity is
derived from mechanical power. From the same
fruitful ten day period dated the revelation that
II current in one wire is broken and restored
another current will be momentarily excited In
an adjacent wire, by what we now call Undue
ton" A wide range OF useful and vexatious
phenomena is covered by this term; and their
nature was the subject OF continued study by
Faraday for years. Another discovery, an
nounced in 1897. related to the time required to
saturate the insulating material around an eec-
trical conductor. and to discharge the same
when the current ceased TO flow. These occur
rences led him to predict the retarding effect
upon the transmission Of messages through an
ocean cable Of the gutta percha coating and
sea water around il.
Clerk Maxwell has been credited with original
ing the theory that light is an electromagnetic
phenomenon and he certainly was an ardent and
intelligent champion Of that notion Bui Fardday,
when Maxwell was yet an infant, was already
irving 10 demonstrate the existence Of rea-
ton between light and magnetism. At six diff
ferent times did he conduct experiments with
this object in view. The last attempt was made
in 1915. when Maxwell Was fourteen years Old
The final work was done with a ray OF polar
lied" light which had been passed in front OK
the poles Of a powerful magnet Tests had been
made with like poles presented to each other.
and with other adjustments Of the apparatus.
Finally. when the magnetic poles were so placed
that the lines of force passing from one TO the
other were invaded by the ray under eXamlna-
tion II was found that the latter bad been al
fected An adjus ,mcnt Of the prisms OF the po-
lariscope was made which eXtnsulshed the ray,
but the influence Of the magnet was such AS 10
rotate the plane Of polarization and render
the ray visible again In this historic demon
stration. as well as in his discovery that some
cub tances are magnetic and others are "dia-
magnetic" Faraday used special kind OF siass
bjch he had made himself, years before when
with Herschel in trying to produce
better telescope lenses than had been available
no TO that time. Although his heavy glass,
as he called IT, was not success Officially, ana
was not really an essential feature OF his eX-
periments with light and magnetism, 1t was an
Interesting item in the chain OF circumstance.
This great master Of science possessed many
personal qualities that compel admiration lie
was excessively modest, and would not accept
the presidency Of either the Royal Institution or
the Royal Society. lie was fond Of simple LAM
euage. and not only preeented his own discov-
cries t. the world il terms that would have been