Images

The first telegraph machine, invented in 1837 by William Fothergill Cook (1806-79) and Charles Wheatstone (1802-1875). The machine had only 20 letters, indicated in the message sent by the slight movement of two needles (from the machine’s...

The oldest surviving photograph, taken by Joseph Nicéphore Niépce (1765-1833) in 1826 using a camera obscura. The photograph (then known as a heliograph) is titled View from the Window at La Gras. Nièpce's innovation was to permanently capture...

A replica of the electromagnet invented by the Canadian engineer William Sturgeon (1783-1850). Sturgeon first devised the electromagnet in 1825; this version was invented around 1832. It was used to create a magnetic force that could provide...

A Watt & Boulton steam engine, one of the key innovations of the Industrial Revolution. Dating to 1788, this example is the oldest original rotative steam engine in the world. Designed and built by James Watt (1736-1819) and Matthew Boulton...

Mosaic with a huge portrait head of Oceanus, surrounded by four nereids and three lines of Latin verse. From Ain Temouchent near Sétif, late 4th or early 5th century CE. Musée national des Antiquités, Algiers, Algeria.

Head of Oceanus, detail of a mosaic from Baths of Themetra near Sousse, beginning of the 3rd century CE. Sousse Archaeological Museum, Tunisia.

The Louisiana Purchase (1803), negotiated during the presidency of Thomas Jefferson (reign 1801–1809) and concluded under Napoleon Bonaparte (as First Consul of France, reign 1799–1804; Emperor 1804–1814/15), doubled the territorial size...

This is an image of the planet Uranus taken by the spacecraft Voyager 2 in 1986. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.

Uranus on the southern frieze of the Gigantomachy. Pergamon Museum, Berlin.

Fish-shaped amulet from the Warka, Iraq, Late Uruk Period, 3300-3000 BCE The British Museum, London.