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 Sources |
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Results 1-5 of 36
Page 39
... inches and two - tenths in length ; but at the equa- tor about thirty - nine inches and one - tenth . Pendulums 40 MECHANICAL POWERS . of the same length vibrate in The Pendulum,
... inches and two - tenths in length ; but at the equa- tor about thirty - nine inches and one - tenth . Pendulums 40 MECHANICAL POWERS . of the same length vibrate in The Pendulum,
Page 43
... inch , there are four ropes shortened each an inch , and therefore the hand must have passed through four inches of space in raising the weight a single inch ; which esta- blishes the maxim , that what is gained in power is lost in ...
... inch , there are four ropes shortened each an inch , and therefore the hand must have passed through four inches of space in raising the weight a single inch ; which esta- blishes the maxim , that what is gained in power is lost in ...
Page 45
... inches thick , and the side twenty inches long , any weight pressing on the back will balance twenty times as much acting on the sides . But the great use of a wedge lies in its being urged , not by pressure , but usually by percussion ...
... inches thick , and the side twenty inches long , any weight pressing on the back will balance twenty times as much acting on the sides . But the great use of a wedge lies in its being urged , not by pressure , but usually by percussion ...
Page 57
... inch of the earth's surface , when the air is heaviest , and that conse- quently a man's body , which contains nearly fifteen square feet , will sustain a weight equal to about fourteen tons and a half ; but this pressure is so great ...
... inch of the earth's surface , when the air is heaviest , and that conse- quently a man's body , which contains nearly fifteen square feet , will sustain a weight equal to about fourteen tons and a half ; but this pressure is so great ...
Page 58
... inches in diameter be put together , and the internal air ex- hausted , the pressure from without will require one hundred and fifty pounds to separate them ; but if the external air be taken away , they will separate of themselves ...
... inches in diameter be put together , and the internal air ex- hausted , the pressure from without will require one hundred and fifty pounds to separate them ; but if the external air be taken away , they will separate of themselves ...
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Other editions - View all
The Literary and Scientific Class Book: Embracing the Leading Facts and ... Levi Washburn Leonard,John Platts No preview available - 2016 |
Common terms and phrases
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
Popular passages
Page 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.
Page 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.
Page 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...
Page 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.
Page 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...
Page 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.
Page 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.
Page 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.
Page 211 - As beasts excel cold rocks and brambles rude ; Men, who their duties know, But know their rights, and, knowing, dare maintain...
Page 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.