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<p>study of fortification.</p>

<p><big>Scientific gunnery</big></p>
<p>In particular he carried out an extensive series of experiments in gunnery, embodying his results in his famous treatise on New Principles of Gunnery (1742), which contains a description of his <a href="page.php?w=ballistic_pendulum">ballistic pendulum</a> (see <a href="page.php?w=gun_chronograph">chronograph</a>).</p>

<p>Robins also made a number of important experiments on the resistance of the air to the motion of projectiles, and on the force of <a href="page.php?w=gunpowder">gunpowder</a>,</p><p>
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