HARRISONs NO 5
Wall Art and Photo Gifts from Mary Evans Picture Library
HARRISONs NO 5
Harrisons number 5 timekeeper or chronometer for finding longitude (an improved version of the number 4). Date: circa 1760
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Media ID 7111325
© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10013416
1760 Chronometer Finding Harrison Harrisons Improved Instruments Longitude Measurement Timekeeper Version
EDITORS COMMENTS
This print showcases Harrison's No. 5, an exquisite timekeeper or chronometer, designed by British clockmaker John Harrison around 1760. Harrison's No. 5 represented an improved version of his renowned No. 4, which revolutionized the measurement of longitude at sea. Longitude, a critical component of navigation, had long been a challenge for mariners, as accurate determination of this essential navigational element was elusive, leading to countless shipwrecks and lives lost. Harrison's ingenious invention, powered by a spring-driven clock mechanism, was designed to keep accurate time at sea, regardless of the vessel's position or the effects of temperature and motion. The chronometer's pendulum, enclosed in a temperature-compensated glass case, ensured consistent timekeeping, allowing mariners to determine their longitude by comparing the time shown on the chronometer with that of a known time source, such as Greenwich Mean Time. This print offers a fascinating glimpse into the scientific ingenuity of the 18th century, showcasing the intricate details of Harrison's No. 5 timekeeper. The intricate gears, delicate balances, and temperature-compensating mechanisms are all depicted in meticulous detail, highlighting the remarkable precision and craftsmanship required to create such an essential navigational instrument. As a testament to Harrison's groundbreaking achievements, his No. 5 timekeeper paved the way for the widespread use of chronometers in maritime navigation, significantly reducing the risks associated with long ocean voyages and revolutionizing the world's maritime industry.
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