metals.--The invention and use of Bronze.--What Steel is.--The
"Lost Arts."--Metallurgy and chemistry.--Oriental Steel.--Modern
definition of Steel.--Invention of Cast Steel.--First iron-ore
discoveries in America.--First American Iron-works.--Early
methods without steam.--First American casting.--Effect of iron
industry upon independence.--Water-power.--The trip-hammer.--The
steam-hammer of Nasmyth.--Machine-tools and their
effects.--First rolling-mill.--Product of the iron industry in
1840-50.--The modern nail, and how it came.--Effect of iron upon
architecture.--The "Sky-Scraper."--Gas as fuel in iron
manufactures.--The Steel of the present.--The invention of
Kelley.--The Bessemer process.--The "Converter."--Present
product of Steel.--The Steel-mill.

THE STORY OF ELECTRICITY.

The oldest and the youngest of the sciences.--Origin of the
name.--Ancient ideas of Electricity.--Later experiments.--Crude
notions and wrong conclusions.--First Electric
Machine.--Frictional Electricity.--The Leyden Jar.--Extreme
ideas and Fakerism.--Franklin, his new ideas and their
reception.--Franklin's Kite.--The Man Franklin.--Experiments
after Franklin, leading to our present modern uses.--Galvani and
his discovery.--Volta, and the first "Battery."--How a battery
acts.--The laws of Electricity, and how they were
discovered.--Induction, and its discoverer.--The line at which
modern Electricity begins.--Magnetism and Electricity.--The
Electro-Magnet.--The Molecular theory.--Faraday, and his Law of
Magnetic Force.