Scientific dialogues for ... young people. Revised by J.W. Griffith1855 |
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Other editions - View all
Scientific Dialogues for ... Young People. Revised by J.W. Griffith Jeremiah Joyce No preview available - 2015 |
Common terms and phrases
angle appear ascend attraction of cohesion attraction of gravitation axis axle ball bottom called cause centre of gravity centre of motion circle consequently CONVERSATION degrees descend diameter distance diurnal motion divided earth eclipse Ephemeris equal equator explain fall feet figure fixed stars fluid force fulcrum gained glass globe grains greater heat heavens heavier Herschel hydrometer inch inclined plane Jupiter kind law of motion length lever light line of direction marble means mechanical power mercury millions of miles minute moon move multiplied Natural Philosophy observe orbit ounces Papa particles pass pendulum perpendicular philosophers piece pipe piston planets poles pound pound weight pressure principle proportion pulleys quantity QUESTIONS FOR EXAMINATION quicksilver reason retrograde motion rise round Saturn screw side space specific gravity square superior planets suppose surface tides tube valve velocity Venus vessel wedge weight wheel
Popular passages
Page 421 - ... as the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Page 174 - 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...
Page 94 - 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, and learn His seasons, hours, or days, or months, or years.
Page 359 - The mercury is sustained in the tube by the pressure of the atmosphere on the surface of the fluid in the cup.
Page 390 - 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.
Page 242 - 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!
Page 394 - If you place a candle before a looking-glass, and stand before it, the image of the candle appears behind it ; but if another looking-glass be so placed as to receive the reflected rays of the candle, and you stand before this second glass, the candle will appear behind that ; because the mind imagines...
Page 150 - 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.