An Easy Grammar of Natural and Experimental Philosophy: for the use of schools. With ten engravings |
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advantage gained angle appear atmosphere attraction axis boards body bound called camera obscura candle centre of gravity colours common concave conductor containing converged convex lens cylinder diameter diurnal motion double convex earth eclipse elastic electric fluid electrified equal Experiment Explain fall fixed focal distance focus force fulcrum Galvanism glass tube Hiftory horizon hydrostatical Illustration inches inclined plane line of direction machine magnetic needle Mavor means meant mechanical powers mercury meridian metal mirror moon motion move north pole object orbit parallel rays particles pass pendulum perpendicular phial piece pipe piston planets plate poles pressure pulley quantity quicksilver rays of light reflected refracting telescope refraction repel retina round screw shews side space specific gravities substances surface tion transits of Venus velocity Venus vessel Vesta vibrates volumes Voyages and Travels weight young perfons