Scientific Dialogues for the Instruction and Entertainment of Young People: In which the First Principles of Natural Experimental Philosophy are Fully Explained and IllustratedBell and Daldy, 1866 - 583 strán (strany) |
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Časté výrazy a frázy
air-pump angle appear atmosphere attraction axis ball barometer body bottom called cause centre of gravity circle concave conductor consequently CONVERSATION convex convex lens degrees diameter direction distance diurnal motion earth eclipse elastic electric fluid equal equator experiment explain fall feet figure fixed stars force fulcrum glass globe grains greater heat heavens heavier hygrometer inches inclined plane Jupiter kind length lens lever machine magnet means mechanical power mercury metal millions of miles moon motion move multiplied nature object observe orbit ounces Papa particles pass perpendicular piece pipe piston planets poles pound weight pounds pressure principle proportion pulleys pump quantity QUESTIONS FOR EXAMINATION quicksilver rays of light refraction retina rise round Saturn screw side sound space specific gravity square substances suppose surface tube turn valve velocity vessel weight wind wire
Populárne pasáže
Strana 176 - Venus a pea, on a circle of 284 feet in diameter ; the Earth also a pea, on a circle of 430 feet ; Mars a rather large pin's head, on a circle of 654 feet ; the Asteroids, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across...
Strana 370 - ... 1 . The rising of the mercury presages, in general, fair weather, and its falling foul •weather, as rain, snow, high winds, and storms.
Strana 98 - To ask or search, I blame thee not; for heaven Is as the book of God before thee set, Wherein to read his wondrous works...
Strana 176 - Pallas, grains of sand, in orbits of from 1000 to 1200 feet; Jupiter a moderate-sized orange, in a circle nearly half a mile across; Saturn a small orange, on a circle of four-fifths of a mile; Uranus a full-sized cherry, or small plum, upon the circumference of a circle more than a mile and a half, and Neptune a good-sized plum on a circle about two miles and a half in diameter.
Strana 370 - When foul weather happens soon after the falling of the mercury expect but little of it ; and on the contrary, expect but little fair weather when it proves fair shortly after the mercury has risen.
Strana 286 - The horizontal distance to which a fluid will spout from a horizontal pipe in any part of the side of an upright vessel, below the surface of the fluid, is equal to twice the length of a perpendicular to the side of the vessel, drawn from the mouth of the pipe to a semicircle described upon the altitude of the fluid : and therefore the...
Strana 394 - This will lead us to the explanation of one of the principal definitions in optics, viz. that the angle of reflection is always equal to the angle of incidence.
Strana 246 - He first established the truth, that a body plunged in a fluid loses as much of its weight as is equal to the weight of an equal volume of the fluid!
Strana 363 - The mercury is sustained in the tube by the pressure of the atmosphere on the surface of the fluid in the cup.
Strana 154 - Its situation with respect to the sun is much like that of the earth ; and by a rotation on its axis it enjoys an agreeable variety of seasons, and of day and night.