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air-pump angle angle of incidence atmosphere attraction ball battery body bottom called causes centre of gravity centrifugal force clouds coil colors condensation convex lens current electricity cylinder direct current direction discharge distance earth effect electric current electricity electrified electro-magnet energy Exercises.—1 Experiment fall feet flow force friction glass heat Hence human voice insulating inversely iron length lens lever Leyden jar light liquid machine magnet mercury metal metres mirror molecules motion move needle negative number of vibrations object opening parallel particles pass pendulum piano piece piston pitch plate pole position pounds pressure prime conductor produce pulley radiation raised rays reflected refracted resistance screw seen shellac shown in Fig shows side solid sound specific gravity spectrum square steam string surface temperature thermometer tion tricity tube vapor velocity vessel weight wheel wind wire zinc
Page 274 - I went into the cube and lived in it, and using lighted candles, electrometers, and all other tests of electrical states, I could not find the least influence upon them, or indication of anything particular given by them, though all the time the outside of the cube was powerfully charged, and large sparks and brushes were darting off from every part of its outer surface.
Page 61 - A wheel and axle is used to raise a bucket from a well. The radius of the wheel is 15...