Popular Lectures on Science and Art: Delivered in the Principal Cities and Towns of the United States, Volume 1Greeley & McElrath, 1849 |
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Popular Lectures on Science and Art: Delivered in the Principal ..., Volume 1 Dionysius Lardner Visualização completa - 1849 |
Termos e frases comuns
acid alkali apparent magnitude appear Arago ascertained astronomical atmosphere attraction barometer baryta body cause centre circumstances clouds color comet conductor consequently degree diameter direction discovery disk distance diurnal motion earth eclipse effect electricity electrified equal experiments fact fluid force full moon glass globe greater Halley's comet heat height hemisphere Herschel hundred inch increased interval John Herschel Jupiter less light liquid luminous lunar lunar phases magnitude mercury metallic meteors millions of miles motion move nature nearly negative object observed orbit pass phenomena physical pile planet pole position present principle produced proportion quantity radiation rays reflected rendered revolves round the sun Saturn seen Sir William Herschel solar solar eclipse solar system space stars substances sun's supposed surface telescope temperature theory thermometer thunder tides tion tricity tube vapor velocity vessel visible Voltaic Voltaic pile weather wire zenith zinc
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Página 429 - In the six hundredth year of Noah's life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great ° deep broken up, and the J windows of heaven were opened.
Página 121 - If any danger to the man should be apprehended (though I think there would be none), let him stand on the floor of his box, and now and then bring near to the rod the loop of a wire that has one end fastened to the leads, he holding it by a wax handle ; so the sparks, if the rod is electrified, will strike from the rod to the wire, and not affect him.
Página 121 - ... of those edifices, upright rods of iron made sharp as a needle, and gilt to prevent rusting, and from the foot of those rods a wire down the outside of the building into the ground, or down round one of the shrouds of a ship, and down her side till it reaches the water? Would not these pointed rods probably draw the electrical fire silently out of a cloud before it came nigh enough to strike, and thereby secure us from that most sudden and terrible mischief?
Página 25 - The square of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the other two sides.
Página 172 - ... animalcule. But how nobly is the darkness which envelopes metaphysical inquiries compensated by the flood of light which is shed upon the physical creation ! There all is harmony, and order, and majesty, and beauty. From the chaos of social and political phenomena exhibited in human records — phenomena unconnected to our imperfect vision by any discoverable law, a war...
Página 122 - With this apparatus, on the appearance of a thunder-gust approaching, he went out into the commons, accompanied by his son," to whom alone he communicated his intentions, well knowing the ridicule which, too generally for the interest of science, awaits unsuccessful experiments in philosophy.
Página 120 - ... large brass scales, of two or more feet beam, the cords of the scales being silk. Suspend the beam by a pack-thread from the ceiling, so that the bottom of the scales may be about a foot from the floor ; the scales will move round in a circle by the untwisting of the pack-thread. Set the iron punch on the end upon the floor, in such a place as that the scales may pass over it in making their circle ; then electrify one scale by applying the wire of a charged phial to it. As they move round, you...
Página 172 - ... with which whatever we are accustomed to call sublimity on our planet, dwindles into ridiculous insignificancy. Most justly has it been said, that nature has implanted in our bosoms a craving after the discovery of truth, and assuredly that glorious instinct is never more irresistibly awakened than when our notice is directed to what is going on in the heavens.
Página 248 - Saturn, yet micrometrical measurements of extreme delicacy" have demonstrated that the coincidence is not mathematically exact, but that the centre of gravity of the rings oscillates round that of the body, describing a very minute orbit, probably under laws of much complexity.
Página 114 - Electricity, which was more generally read and admired in all parts of Europe than these letters. There is hardly any European language into which they have not been translated...