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<p>do not have to be determined, allowing a greater accuracy. For about a century, until the 1930s, Kater's pendulum and its various refinements remained the standard method for measuring the strength of the Earth's gravity during <a href="page.php?w=Geodetics">geodetic</a> surveys. It is now used only for demonstrating pendulum principles.</p>

<p><big>Description</big></p>
<p>A pendulum can be used to measure the <a href="page.php?w=Gravitational_acceleration">acceleration of gravity</a> g because for narrow swings (when the <a href="page.php?w=small_angle_approximation">small angle approximation</a></p><p>
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