The Literary and Scientific Class Book: Embracing the Leading Facts and Principles of Science with Many Difficult Words Explained at the Heads of the Lessons, and Questions Annexed for Examination. Selected from the Rev. John Platts' Literary and Scientific Class Book, and from Various Other SourcesJohn Prentiss, 1827 - Всего страниц: 318 |
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Стр. 39
... vibrations . The common remedy for this inconvenience is raising or lowering the weight of the pendulum , by means of a screw , as occasion may require . Pendulums vibrate faster towards the poles , and slowest at the equator . This is ...
... vibrations . The common remedy for this inconvenience is raising or lowering the weight of the pendulum , by means of a screw , as occasion may require . Pendulums vibrate faster towards the poles , and slowest at the equator . This is ...
Стр. 40
... vibrate in the same time however differ- ent in weight . QUESTIONS . - 1 . In what direction will a body move when ... vibrates . 13. Why is not the motion of a pendulum perpetual ? 14. Why do clocks go faster in winter than in summer ...
... vibrate in the same time however differ- ent in weight . QUESTIONS . - 1 . In what direction will a body move when ... vibrates . 13. Why is not the motion of a pendulum perpetual ? 14. Why do clocks go faster in winter than in summer ...
Стр. 61
... vibrating motion in elas- tic bodies , which is caused by a stroke or collision , and is carried to the ear through the medium of the air . The pro- duction of sound therefore depends upon three circumstan- ces , a sonorous body to give ...
... vibrating motion in elas- tic bodies , which is caused by a stroke or collision , and is carried to the ear through the medium of the air . The pro- duction of sound therefore depends upon three circumstan- ces , a sonorous body to give ...
Стр. 62
... vibrations , and are composed of a motion forwards and back- wards , similar to those of a sonorous body . They differ also in the one taking place in a plane , the other in all directions : the aerial undulations being spherical . The ...
... vibrations , and are composed of a motion forwards and back- wards , similar to those of a sonorous body . They differ also in the one taking place in a plane , the other in all directions : the aerial undulations being spherical . The ...
Стр. 63
... vibrations meet with an obstacle , having a hard and regular surface , such as a wall or rock , they are reflected back to the ear , and produce the same sound a second time ; but the sound will then appear to proceed from the object by ...
... vibrations meet with an obstacle , having a hard and regular surface , such as a wall or rock , they are reflected back to the ear , and produce the same sound a second time ; but the sound will then appear to proceed from the object by ...
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The Literary and Scientific Class Book: Embracing the Leading Facts and ... Levi Washburn Leonard,John Platts Недоступно для просмотра - 2016 |
Часто встречающиеся слова и выражения
acid angle animal animalcules apparent magnitude appear atmospheric air attraction axis barometer called caloric candle celestial centre combined combustion comets concave conductor convex lens dark degree Describe diameter distance diving bell earth eclipse elasticity electric equal equator fall fixed flower fluid focus force glass gravity heat heavens hundred inch insects invented iron Jupiter kind lenses LESSON machine magnet magnifying magnitude mercury meridian metal microscope millions of miles minerals minutes mirror moon motion naked eye nature night object optics orbit oxyd oxygen particles pass piece piston planets plate poles prism produced QUESTIONS.-1 rays of light rection reflected refraction retina revolve round round the sun salts side sidereal day skreen solar solar day solid sonorous body sound specific gravities stars substances sulphur sulphuric acid surface telescope tion tube Uranus valve vapour vegetable vessel Vesta vibrations weather weight
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Стр. 228 - TO him who in the love of nature holds Communion with her visible forms, she speaks A various language; for his gayer hours She has a voice of gladness, and a smile And eloquence of beauty, and she glides Into his darker musings, with a mild And healing sympathy, that steals away Their sharpness, ere he is aware.
Стр. 156 - Soft roll your incense, herbs, and fruits, and flowers, In mingled clouds to Him, whose sun exalts, • Whose breath perfumes you, -and whose pencil paints.
Стр. ii - District, has deposited in this office the title of a book, the right whereof he claims as proprietor, in the words following, to wit : " THE CHILD'S BOTANY," In conformity to the act of the Congress of the United States, entitled, " An act for the encouragement of learning by securing the copies of maps, charts, and books to the authors and proprietors of such copies, during the times therein mentioned...
Стр. 228 - A man of a polite imagination is let into a great many pleasures that the vulgar are not capable of receiving. He can converse with a picture and find an agreeable companion in a statue. He meets with a secret refreshment in a description, and often feels a greater satisfaction in the prospect of fields and meadows, than another does in the possession.
Стр. 230 - THESE, as they change, ALMIGHTY FATHER, these Are but the varied God. The rolling year Is full of THEE. Forth in the pleasing Spring THY beauty walks, THY tenderness and love. Wide flush the fields ; the softening air is balm ; Echo the mountains round ; the forest smiles ; And every sense, and every heart is joy. Then comes THY glory in the Summer months, With light and heat refulgent. Then THY sun...
Стр. 61 - O'er mountain, tower, and town, Or, mirrored in the ocean vast, A thousand fathoms down ! As fresh in yon horizon dark, As young thy beauties seem. As when the eagle from the ark First sported in thy beam. For, faithful to its sacred page, Heaven still rebuilds thy span • Nor lets the type grow pale with age That first spoke peace to man.
Стр. 88 - ... gaze, And steers, undoubting, to the friendly coast ; And they who stray in perilous wastes, by night, Are glad when thou dost shine to guide their footsteps right. And, therefore, bards of old, Sages, and hermits of the solemn wood, Did in thy beams behold A beauteous type of that unchanging good, That bright eternal beacon, by whose ray The voyager of time should shape his heedful way.
Стр. 20 - The world is full of poetry — the air Is living with its spirit ; and the waves Dance to the music of its melodies, And sparkle in its brightness. Earth is veiled, And mantled with its beauty; and the walls That close the universe with crystal in, Are eloquent with voices, that proclaim The unseen glories of immensity, In harmonies, too perfect, and too high, For aught but beings of celestial mould, And speak to man in one eternal hymn, Unfading beauty, and unyielding power.
Стр. 211 - As beasts excel cold rocks and brambles rude ; Men, who their duties know, But know their rights, and, knowing, dare maintain...
Стр. 68 - Horrid with frost and turbulent with storm, Blows autumn, and his golden fruits, away : Then melts into the spring : soft spring, with breath Favonian, from warm chambers of the south, Recalls the first.