Scientific dialogues, with corrections by O. Gregory1861 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
angle appear astronomers atmosphere attraction axis ball barometer body bottom called centre of gravity comet conductor consequently CONVERSATION convex lens cubic foot cylinder degrees descend diameter direction distance diurnal motion earth eclipse electricity Ephemeris equal equator experiment fall feet fixed stars fluid force fulcrum glass globe grains greater heat heavens horizon hygrometer inches inclined plane instrument iron Jupiter kind length less lever light magnet means mechanical power mercury metal millions of miles minutes moon motion move multiplied observe orbit ounces papa pass pendulum perpendicular piece pipe piston planets poles pound pound weight pressure principle produced proportion pulleys pump quantity quicksilver rays refracting telescope refraction rise rotation round Saturn screw seen side silver space specific gravity square steam substance suppose surface thermometer tube upward valve velocity vessel weight wire
Beliebte Passagen
Seite 302 - 2. In very hot weather, the falling of the mercury indicates thunder. 3. In winter, the rising presages frost; and in frosty weather if the mercury falls three or four divisions, there will be a thaw. But in a continued frost, if the mercury rises, it will
Seite 119 - in the latitude of London, as much of the ecliptic rises about Pisces and Aries in two hours as the moon goes through in six days ; therefore, while the moon is in these signs, she differs but two hours in rising for six days together, that is, one day with another,
Seite 373 - is viewed by the eye-glass ef, which is so placed that the image gh may be in , the focus, and the eye at about an equal distance on the other side; the rays of each pencil will be parallel, after going out of the eye-glass, as at e and f, till they come to the eye at
Seite 302 - 6. In fair weather, when the mercury falls much and low, and thus continues for two or three days before the rain comes, then a great deal of wet may be expected,
Seite 302 - little of it; on the contrary, expect but little fair weather, when it proves fair shortly after the mercury has risen. 6. In fair weather, when the mercury falls much and low, and thus continues for two or three days before the rain comes, then
Seite 8 - of an inch in diameter; and as the drop occupied a circle on a plate of glass containing 529 of these squares, there must have been in this single drop of water, taken at random out of the sea, and in a place by no means the most discoloured,
Seite 455 - the sea seems to boil, and send up a smoke under them, rising in a sort of hill towards the spout. A rumbling noise is often heard at the time of their appearance, which happens generally in those months that are peculiarly subject to thunder storms, and they are commonly accompanied or followed by lightning.
Seite 181 - when immersed in water, loses as much of its weight as is equal to the weight of a bulk of water of the same magnitude.
Seite 100 - any meridian on the earth will revolve from a fixed star to that star again in exactly the same time, as if the earth had only a diurnal motion and remained always in the same part of its orbit. But with respect to the sun, .as the earth advances