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acts amount angle atmosphere attraction battery becomes body bottom called carried causes centre charge closed clouds coil cold colors conductor connected direction distance earth effect electricity energy equal Experiment fall feet flow force given gives glass gravity greater half hand heat Hence higher hold inches increase iron keep kind length lens lever light liquid lower machine magnet mass matter means measure mercury metal middle miles molecules motion move needle negative notice object opening parallel particles pass piece pitch plate pole position pounds pressure produce raised rays reflected resistance result rise scale seen shown shows side solid sound square steam string surface temperature tion tube turn unit upper vapor vessel vibrations weight wheel whole wind wire
Σελίδα 272 - 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.
Σελίδα 59 - A wheel and axle is used to raise a bucket from a well. The radius of the wheel is 15...
Σελίδα 131 - Nothing can be more surprising,' writes Sir John Herschel, in reference to this subject, 'than to see two persons, neither of them deaf, the one complaining of the penetrating shrillness of a sound, while the other maintains there is no sound at all.