People, technology & history

Charles Wheatstone		William Cooke		Samuel Morse		The Need for Codes
Learn Semaphore		Learn Morse code		Voltage, Current, Resistance		Basic Principles of Telegraphy
A Simple Morse Circuit		Construction of Telegraph Cables		Faults in Submarine Telegraph Cables		Testing a Cable
How Capacitance works		Gutta Percha		The Morse Key