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angles angular velocity applied approximately axis boundary calculated centimetres centre of inertia circular circulation compass component velocity condition configuration constant corresponding curve cylinder denote diagram direction disc distance disturbance dynamical elastic electric ellipsoid equal equation equilibrium equipotentials finite fixed fluid flywheel force forcive formula function given gives globule gravity gyrostat Hence horizontal impulse incompressible infinitely small infinitesimal instant integral inviscid irrotational kinetic energy Laplace's liquid Lord Kelvin magnetic mass mathematical Mercator chart momentum moving Natural Philosophy paper parallel particle pendulum period perpendicular Phil plane portion position potential pressure problem radius resultant rigid rigid body ring rotation round shell side simple sinusoidal small in comparison solid solution space spherical stable steady motion suppose surface theorem theory Thomson and Tait's toroidal values velocity potential vertical vibration viscosity vortex motion vortex rings vortices wave-length waves whole zero