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<p> It was Kelvin who proposed using an analogue computer to solve the equations which arise from the relative motion of the ships engaged in the battle and the time delay in the flight of the shell to calculate the required trajectory and therefore the direction and elevation of the guns.  Kelvin's brother <a href="page.php?w=James_Thomson_%28engineer%29">James Thomson</a> was responsible for producing a tidal analyser using a ball, disc and cylinder <a href="page.php?w=differential_analyser">differential analyser</a> which was the original source</p><p>
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