Elements of Physics Or Natural HistoryAppleton, 1882 |
Inhalt
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
action appear atmosphere atmospheric pressure attraction axle balance ball beam body boiling bottom called camera obscura carbonic acid cause centre of gravity centrifugal force chemical cohesion cold colours combustion common cooled degree direction distance earth effect elastic electricity Energy equal fact fall feet flame fluid force friction gases glass gradually greater heat heat-rays Hence hydrogen Hydrometer inch inclined plane increase instance intensity iron latent heat length lens less lever light liquid mass mercury metal miles molecules motion moving nearly object obliquely oxygen particles pass pendulum phosphorus piston placed plate pound pressure produced proportion quantity rays reflected refraction resistance retina rise round seen ship side solid sound space specific gravity spring steam substance sulphuric acid surface temperature thermometer tion tube turn vapour velocity vessel vibrations waves weight wheel whole wind zinc
Beliebte Passagen
Seite 488 - It regulates with perfect accuracy and uniformity the number of its strokes in a given time, counting or recording them, moreover, to tell how much work it has done, as a clock records the beats of its pendulum ; it regulates the quantity of steam admitted to work, the briskness of the fire, the supply of water to the boiler, the supply of coals to the fire ; it opens and shuts its valves with absolute precision as to time and manner ; it oils its joints ; it takes out any air which may accidentally...
Seite 465 - ... will prevent the metal from running away, and in a few minutes it will cool and take the impression, without the slightest injury to the paper from which it was taken.
Seite 366 - When horses or mules march in company at night, those in front direct their ears forward...
Seite 379 - ... bar commences to oscillate to and fro, the swing gradually increasing in amplitude until the dead centre is passed over, when several complete revolutions are made. The torsion of the suspending fibre now offers resistance to the revolutions, and the bar commences to turn in the opposite direction. This movement is kept up with great energy and regularity as long as the candle burns. The author discusses the action of ice, or a cold substance, on the suspended index.
Seite 130 - ... turns or beats of the balance-wheel; and thus the exertion during a few seconds, of the hand which winds up, gives motion for twenty-four or thirty hours.
Seite 211 - The velocity of waves has relation to their magnitude. The large waves just spoken of, proceed at the rate of from thirty to forty miles an hour. — It is a vulgar belief that the water itself advances with the speed of the wave, but in fact the...
Seite 212 - Calcutta it sometimes occasions an instantaneous rise of five feet ; and both here, and in every other part of its track, the boats, on its approach, immediately quit the shore, and make for safety to the middle of the river. In the channels, between the islands in the mouth of the Megna, the height of the Bore is said to exceed twelve feet ; and is so terrific in its appearance, and dangerous in its consequences, that no boat will venture to pass at springtide f.