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An example of Babylonian writing.

Babylonian Writing

An example of Babylonian writing.

This apparatus illustrates the principle stating that liquids tend to find their own level.

Vessels in Communication

This apparatus illustrates the principle stating that liquids tend to find their own level.

Samuel Morse explaining his telegraph to members of Congress. Morse made his last trip to Washington, D.C., in December 1842, stringing "wires between two committee rooms in the Capitol, and sent messages back and forth" to demonstrate his telegraph system.

Samuel Morse

Samuel Morse explaining his telegraph to members of Congress. Morse made his last trip to Washington,…

Advertising is a form of communication intended to persuade its viewers, readers or listeners to take some action. It usually includes the name of a product or service and how that product or service could benefit the consumer, to persuade potential customers to purchase or to consume that particular brand. Modern advertising developed with the rise of mass production in the late 19th and early 20th centuries. Commercial advertisers often seek to generate increased consumption of their products or services through branding, which involves the repetition of an image or product name in an effort to associate related qualities with the brand in the minds of consumers. Different types of media can be used to deliver these messages, including traditional media such as newspapers, magazines, television, radio, billboards or direct mail.

Advertisement Sign

Advertising is a form of communication intended to persuade its viewers, readers or listeners to take…

A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead.

Railway Signal

A signal is a mechanical or electrical device erected beside a railway line to pass information relating…

A man operating an electro-magnetic telegraph.

Telegraph

A man operating an electro-magnetic telegraph.