Introduction to channel capacity, symbol rate (baud) & message space. This is the first step towards more modern measures of information. Featuring the Baudot multiplex system & Thomas Edison's quadruplex telegraph.

Play with the pulse generator! http://www.khanacademy.org/cs/symbol-...​
Play with message space generator! http://www.khanacademy.org/cs/message...​
References: Transmission of Information - R. V. L. Hartley An Introduction to Information Theory: Symbols, Signals and Noise - John R. Pierce