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Salem Witch Trials
Definition by Joshua J. Mark

Salem Witch Trials

The Salem Witch Trials were a series of legal proceedings in Salem, Massachusetts in 1692-1693 resulting in the deaths of 20 innocent people accused of witchcraft and the vilification of over 200 others based, initially, on the reports of...
John Locke
Definition by Mark Cartwright

John Locke

John Locke (1632-1704) was an English philosopher responsible for laying the foundation of the European Enlightenment. Locke believed that each branch of government should have separate powers, that liberty must be protected from state interference...
Harrison's Marine Chronometer
Article by Mark Cartwright

Harrison's Marine Chronometer

John Harrison (1693-1776) invented an accurate marine chronometer after several decades of research and development. While the pendulum clock had already been invented in the 17th century, a clock that could withstand the vagaries of the...
Peter the Great
Definition by Liana Miate

Peter the Great

Peter I of Russia (Peter the Great) was the Tsar of Russia from 1682-1721 and Emperor of Russia from 1721-1725. During his long reign, Peter had absolute power and brought real change to Russia, including building its first navy, introducing...
Edmond Halley
Definition by Mark Cartwright

Edmond Halley

Edmond Halley (1656-1742) was an English astronomer, mathematician, and cartographer. Halley's Comet is named after him since he accurately predicted its return in 1758. One of the early globetrotting scientists, Halley led several maritime...
Ihara Saikaku
Definition by Graham Squires

Ihara Saikaku

Ihara Saikaku (1642-1693) was a Japanese poet and novelist who played a leading role in creating the so-called ‘floating world’ (ukiyo-zoshi) genre of popular literature in the 17th century. His work was significant because, in terms of both...
Workings of Harrison's H5 Chronometer
Image by Science Museum, London

Workings of Harrison's H5 Chronometer

The workings of the H5 marine chronometer designed and built by the English clockmaker John Harrison (1693-1776). This was the last in the series of chronometers Harrison made for mariners to better measure longitude. Silver with a white...
Harrison's H5 Marine Chronometer
Image by Science Museum, London

Harrison's H5 Marine Chronometer

The H5 marine chronometer, designed and built by the English clockmaker John Harrison (1693-1776). This was the last in the series of chronometers Harrison made for mariners to better measure longitude and so define their position at sea...
Interior Mechanism of the Harrison Chronometer
Image by Science Museum, London

Interior Mechanism of the Harrison Chronometer

A view of the interior workings of the H5 marine chronometer designed and built by the English clockmaker John Harrison (1693-1776). This was the last in the series of chronometers Harrison made for mariners to better measure longitude. Silver...
Portrait of John Harrison
Image by Science Museum, London

Portrait of John Harrison

A c. 1767 portrait by Thomas King of the English clockmaker John Harrison (1693-1776) who invented the marine chronometer to accurately measure longitude. The chronometer he is holding is the H3, one of a series of five watches he made. (Science...
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