A Manual of Natural Philosophy ... |
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air-pump angle angle of incidence aperture apparent magnitude appear atmosphere attraction axis ball bottom called centre of gravity colors concave concave lens convex convex lens cord course crystalline lens cylinder diameter direction discharge distance double-convex lens earth effect elasticity electricity equal excited experiment eye-glass fall feet figure fluid focus force friction glass inches inclined plane instrument insulated inverted iron kind length lever Leyden jar liquid magnet manner means mercury metallic mirror motion move north pole object observed particles pass pendulum perpendicular piece piston placed plane plate polarized portion position pounds pressure prime conductor prism produced pulley quantity QUESTION ray of light reflected refracted retina rise screw sealing-wax seen shown side solid sound south pole specific gravity spectrum substance supposed surface suspended telescope tion tube upper usually valve velocity vessel vibrations weight wheel wire