e.
The electric current decomposes the copper, which is deposited in a
thin film upon the mould. This film is removed and stiffened by being
backed with metal.

What is the difference between Electrotyping and Stereotyping?

In stereotyping, a plaster of Paris mould is taken from the types, and
upon this mould melted type-metal is poured, which, when hardened,
makes a solid plate.

Is there any other method of stereotyping?

Yes; that known as the paper process. A uniform sheet of soft matter
is formed by pasting together sheets of thin, tough tissue paper. The
types are oiled, and the soft, moist sheet is placed on them and
beaten down with a stiff brush until it receives an impression of the
type-form. Both are then run through a press, and on being taken out
the paper is found to form a perfect mould. Into this mould the
type-metal is poured and the plate formed.

Can you tell me some magnetic effects of the current?

All conductors become magnetic during the passage of a current through
them, and thereby acquire all the properties of a magnet. There are
bodies which are natural magnets, and they are called permanent
magnets. Those which become magnets only during the passage of a
current are called electro-magnets.

Do you know any application of those magnets?

They are employed in a great variety of electrical apparatus,
principally in telegraphy.

When was the first telegraph established?

It was made in 1836, being invented by Prof. Steinheil, of Munich, and
adopted by the government of Bavaria. It was 12 miles long, and the
signals were made by small bells.

Who was the inventor of the telegraph in this country?

Samuel F.B. Morse, who was born at Charlestown, Mass., April 27, 1791.
He began life as a painter, but did not give his whole attention to
art--chemistry and experiments in electricity and galvanism claiming
much of his time. He first conceived the idea of the telegraph in
1832, and exhibited his invention to Congress in 1837. He struggled on
with scanty means, and was about to give up in despair when Congress
appropriated $30,000 for an experimental line, which was opened on May
12, 1844, between Washington and Baltimore. Prof. Morse died in 1872,
but not before he had reaped honors and fortune from his invention.

How rapidly does the electric current travel through the wires?

From experiments made it appears to be about 15,400 miles in a second.

Can more than one