Obscure origin of many inventions
Inventions born before their time
"Nothing new under the sun"
The power of steam known to the ancients
Passage from Roger Bacon
Old inventions revived
Printing
Atmospheric locomotion
The balloon
The reaping machine
Tunnels
Gunpowder
Ancient firearms
The steam gun
The Congreve rocket
Coal-gas
Hydropathy
Anaesthetic agents
The Daguerreotype anticipated
The electric telegraph not new
Forgotten inventors
Disputed inventions
Simultaneous inventions
Inventions made step by step
James Watt's difficulties with his workmen
Improvements in modern machine-tools
Their perfection
The engines of "The Warrior"