Search Results: John Harrison

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...

The Siege of Fort Meigs (28 April to 9 May 1813) was a major engagement on the northwestern frontier of the War of 1812. It saw a US army under Major General William Henry Harrison, holed up in the hastily built Fort Meigs, withstand a siege...

The Battle of the Thames (5 October 1813), or the Battle of Moraviantown, was a decisive engagement in the War of 1812, in which a US army under General William Henry Harrison defeated a British and Native American force in Upper Canada...

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...

The Battle of the River Raisin (18-23 January 1813), also known as the Battle of Frenchtown or the River Raisin Massacre, was a significant engagement in the War of 1812. It saw the defeat of a US army at Frenchtown (modern-day Monroe, Michigan...

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...

The War of 1812 (1812-1815), referred to by some contemporaries as the Second American Revolution, was fought between the United States and the United Kingdom. Often remembered only as a sideshow to the Napoleonic Wars, the war had some long-term...

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...

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...

John Harrison’s first marine timepiece, called H1 and created between 1730 and 1735, was designed to allow navigators to keep Greenwich time and so accurately calculate their longitude position. (National Maritime Museum, Greenwich)