HARRISONs FOURTH

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HARRISONs FOURTH

Duplicate of John Harrisons number 4 timekeeper, made by Larcum Kendall and taken by Captain Cook on his second and third voyages Date: 1767

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Media ID 23030572

© Illustrated London News Ltd/Mary Evans

1767 Cook Fourth Harrison Harrisons Instruments Kendall Measurement Timekeeper Voyages Duplicate Made

EDITORS COMMENTS
This historic print depicts Harrison's Fourth, a duplicate of John Harrison's groundbreaking timekeeper, H4, which was constructed by Larcum Kendall and taken on Captain James Cook's second and third voyages in 1767. Harrison's H4, also known as the Marine Chronometer, revolutionized the field of time measurement at sea. The precision of this instrument enabled navigators to determine their longitude with greater accuracy, a significant advancement in the age of exploration. John Harrison, an English carpenter and clockmaker, is famously known for his innovation in creating marine chronometers. The H4 was the culmination of his lifelong quest to build a clock that could maintain accuracy at sea, despite the rocking and rolling of the ship. With the help of Larcum Kendall, Harrison's assistant, they created a timepiece that could keep time within a few seconds per day, a remarkable achievement at the time. Captain Cook, an accomplished explorer, recognized the importance of this invention and brought Harrison's H4 on his voyages to the Pacific Ocean between 1772 and 1775. The duplicate H4 in this print was likely used to verify the accuracy of the original, ensuring that Cook's voyages were as successful and precise as possible. This print is a testament to the ingenuity and determination of Harrison and Kendall, and their impact on the scientific community during the 18th century. Their work paved the way for further advancements in navigation and time measurement, ultimately contributing to the Age of Discovery and the expansion of global knowledge.

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