History of Oceanography: Voyages of Exploration and Science
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H3 was built during the period 1740 to 1759. Even after 19 years of work
on it H3 did not meet the accuracy required by the Board of Longitude.
H3 incorporated two inventions of Harrison’s, a bimetallic strip,
to compensate the balance spring for the effects of changes in temperature,
and the caged roller bearing, the ultimate version of his anti-friction
devices. Both of these inventions are still used in a variety of machines
today. Despite these innovations, work on H3 seemed to lead nowhere and
its ultimate role was to convince Harrison that the solution to the longitude
problem lay in an entirely different design.
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