In Crown 8vo. Price 3s. 6d. Postage Threepence. 
Specimen-page from Prof. Jamieson’s “ Elementary Manual of 
Magnetism and Electricity.” 
€. 45-9 
LECTURE VI. 
CoNTENTS.—Magnetic Induction—Definition of Induction—Secondary 
Induction—In the Case of Induction the Attraction always takes place 
between Two Magnets—Action and Reaction are Equal and Opposite 
—Inductive Effects of Like and Unlike Poles—Polarity Reversed, or 
Consequent Poles produced by Induction—Questions. 
EXPERIMENTS XV.—Magnetie Induction.—Take a straight 
strip of soft iron (about 10 inches long and about 1 inch 
broad), and hold it close above some iron filings. No filings will 
be found adhering to the strip. Now lay along the strip a thin 
piece of wood, and on the wood a strong bar magnet of about the 
same length as the soft iron strip. Tie the three together with 
string, as shown by the figure. Again hold the soft iron close 
above the filings, tak- 
ing care that the mag- 
net does not approach 
too near them. This 
time it will be found 
that the iron strip has 
become a magnet, for 
it attracts some of the 
filings to itself, al- 
though it is not even 
touched by themagnet. Tron Filings 
This peculiarity P0s- goon Ton BAR MAGNETISED INDUCTIVELY 
sessed by magnetic BY BAR MAGNET. 
force, of being able to 
act upon other magnetisable bodies at a distance, is known as 
magnetic wnduction. 
DEFINITION.—WMagnetice Induction is the name given to the 
action and reaction which take place when the magnetic force 
springing from one body makes evident the latent magnetism in 
another body, either, with or without actual contact between the bodies. 
The body from which the force emanates is called the induerng 
body ; while that upon which the force acts is called the body under 
induction. 
Strictly speaking, there ought to be an interval or gap between 
the inducing body and the one which is under induction; but it 
