Natural Philosophy for High Schools and Academies1868 - 413 من الصفحات |
المحتوى
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
absorbed acid angle angle of incidence atmosphere axis ball battery becomes body bulb called centre cloud coil colors column of air conductor convex convex lens copper crystalline lens cylinder direction distance earth elastic electricity ether expansion extraordinary ray fall flame focus force fork formed frictional electricity galvanometer gases give glass gravity Hence inches increases instrument latent heat length lens lines liquid luminous machine magnet means mercury metallic mirror molecules motion move musical sound needle object optic nerve ordinary ordinary ray particles passes pendulum pipe placed plane plate platinum polarized light pole pound pressure prism produced radiations ray of light reflected refracted retina rings rise seen shown in Figure side solid sound-wave specific heat spectrum string substance surface temperature thermometer tion tourmaline transmitted tube vapor velocity of sound vessel vibrations waves weight wheel wind wire zinc
مقاطع مشهورة
الصفحة 32 - ... that it is the pressure of the atmosphere on the surface of the water in the dish which keeps the water in the inverted jar.
الصفحة 371 - The creaking of ray hoots sets it in violent commotion. The crumpling, or tearing of a bit of paper, or the rustle of a silk dress, does the same. It is startled by the patter of a raindrop.
الصفحة 22 - This result gives the weight of a bulk of water equal to that of the specimen, and by dividing the weight of the specimen in air by this number, the specific gravity is obtained.
الصفحة 371 - Her ivory forehead full of bounty brave, Like a broad table did itself dispread, For Love his lofty triumphs to engrave, ' And write the battles of his great godhead : All good and honour might therein be read; For there their dwelling was.
الصفحة 173 - ... after reflection that it had " before incidence. Hence the reflected rays, on being produced back, will meet at a point as far behind the reflector as the point of the object is in front of it. Now, because the eye sees objects in the direction from which the rays reach it (Art.
الصفحة 60 - There are various ways of agitating the air at the ends of pipes and tubes, so as to throw the columns within them into vibration. In organ-pipes this is done by blowing a thin sheet of air against a sharp edge. This produces a flutter, some particular pulse of which is then converted into a musical sound by the resonance of the associated column of air.
الصفحة 365 - ... seems to be secured, so that for ourselves and for long generations after us we have nothing to fear. But the same forces of air and water, and of the volcanic interior, which produced former geological revolutions, and buried one series of living forms after another, act still upon the earth's crust. They more probably will bring about the last day of the human race than those distant cosmical alterations of which we have spoken...
الصفحة 369 - I observed that the flame of the last-mentioned burner exhibited pulsations in height which were exactly synchronous with the audible beats. This phenomenon was very striking to every one in the room, and especially so when the strong notes of the violoncello came in. It was exceedingly interesting to observe how perfectly even the trills of this instrument were reflected on the sheet of flame. A deaf man might have seen the harmony.
الصفحة 365 - ... bloomed, and dropped its costly gum on the earth and in the sea ; when in Siberia, Europe, and North America groves of tropical palms flourished ; where gigantic lizards, and after them elephants, whose mighty remains we still find buried in the earth, found a home? Different geologists, proceeding from different premises, have sought to estimate the duration of the above-named...
الصفحة 257 - The inducing magnet is placed vertically on the magnet to be formed, and moved from the ends to the bend, or in the opposite way, and brought round again, in an arch, to the starting-point. A soft iron armature is placed at the poles of the induced magnet. That the operation may succeed well, it is necessary for both magnets to be of the same width.