The Literary and Scientific Class Book: Embracing the Leading Facts and Principles of Science, Illustrated with Engravings, with Many Difficult Words Explained at the Heads of the Lessons, and Questions Annexed for Examination : Designed as Exercises for the Reading and Study of the Higher Classes in Common Schools : Selected from the Rev. John Platts' Literary and Scientific Class Book, and from Various Other Sources and Adapted to the Wants and Condition of Youth in the United StatesJ. and J.W. Prentiss, 1833 - 318 sider |
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Side 69
... convex surface , that ray only , which falls in the di- rection of the axis of the lens , is perpendicular to the surface , the other rays falling obliquely , are refracted towards the axis , and they will meet beyond the lens at a ...
... convex surface , that ray only , which falls in the di- rection of the axis of the lens , is perpendicular to the surface , the other rays falling obliquely , are refracted towards the axis , and they will meet beyond the lens at a ...
Side 70
... convex surface of the lens forms a portion . The last kind of lens is called a mēnis'cus , being convex on one side and concave on the other , like the glass or crystal of a watch . the All the parallel rays of the sun which pass through a ...
... convex surface of the lens forms a portion . The last kind of lens is called a mēnis'cus , being convex on one side and concave on the other , like the glass or crystal of a watch . the All the parallel rays of the sun which pass through a ...
Side 71
... convex lens will be inverted . If you cause the rays of light from the flame of a candle to pass through the glass of a common spectacle , and receive them on a sheet of paper , or dark skreen placed at a proper distance , you will see ...
... convex lens will be inverted . If you cause the rays of light from the flame of a candle to pass through the glass of a common spectacle , and receive them on a sheet of paper , or dark skreen placed at a proper distance , you will see ...
Side 79
... convex lens ; and as every point of an object sends out rays in all directions , some rays from each point on the side next the eye will be con- verged and brought to as many points on the retina , and will form on it a distinct ...
... convex lens ; and as every point of an object sends out rays in all directions , some rays from each point on the side next the eye will be con- verged and brought to as many points on the retina , and will form on it a distinct ...
Side 82
... convex lens is , to render an object distinctly visible to the eye at the distance of its focus . With a knowledge ... convex lenses , having the object placed in the focus , and the eye at the same distance on the other side . If rays ...
... convex lens is , to render an object distinctly visible to the eye at the distance of its focus . With a knowledge ... convex lenses , having the object placed in the focus , and the eye at the same distance on the other side . If rays ...
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Almindelige termer og sætninger
acid angle animals apparent magnitude appear astronomers atmospheric air attraction axis beautiful become called caloric carbon carbonic acid centre colour combined combustion comets conductor consists convex convex lens copper dark degree Describe diameter distance diurnal motion earth eclipse electricity equal equator fixed flowers fluid focus force glass glottis gold gravity heat heavens hundred hydrogen inches insects iron Jupiter kind lens LESSON Linnæus machine magnet mercury metals microscope miles minerals moon motion nature Newtonian telescope night object orbit oxyd oxygen particles pass piece piston plants plates poles produced quantity QUESTIONS.-1 rays of light reflected refraction retina revolve round round the sun salts Saturn side sidereal day silver solar solid sonorous body sound species specific gravities stamens stars substances sulphur sulphuric acid surface telescope tion tube Uranus valve vapour various vegetable vessel vibrations weight
Populære passager
Side 272 - 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.
Side ii - District Clerk's Office. BE IT REMEMBERED, That on the seventh day of May, AD 1828, in the fifty-second year of the Independence of the UNITED STATES OF AMERICA, SG Goodrich, of the said District, has deposited in this office the title of a book, the right whereof he claims as proprietor, in the words following, to wit...
Side 274 - 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...
Side 251 - In forest, brake or den, As beasts excel cold rocks and brambles rude ; Men who their duties know, But know their rights, and, knowing, dare maintain, Prevent the long-aimed blow, And crush the tyrant while they rend the chain ; These constitute a State; And sovereign law, that State's collected will, O'er thrones and globes elate Sits empress, crowning good, repressing ill.
Side 251 - What Constitutes a State? WHAT constitutes a State? Not high-raised battlement or labored mound, Thick wall or moated gate — Not cities proud with spires and turrets crowned — Not bays and broad-armed ports, Where, laughing at the storm, rich navies ride — Not starred and spangled courts, Where low-browed baseness wafts perfume to pride. No; men, high-minded men...
Side 75 - TRIUMPHAL arch, that fill'st the sky When storms prepare to part, I ask not proud Philosophy To teach me what thou art — Still seem as to my childhood's sight, A midway station given For happy spirits to alight Betwixt the earth and heaven.
Side 122 - ... 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.
Side 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.
Side 93 - As home he goes beneath the joyous moon. Ye that keep watch in heaven, as earth asleep Unconscious lies, effuse your mildest beams, Ye constellations, while your angels strike, Amid the spangled sky, the silver lyre. Great source of day ! best image here below Of thy Creator, ever pouring wide, From world to world, the vital ocean round, On nature write with every beam His praise.
Side 121 - Her constellations come, and climb the heavens, and go. Day, too, hath many a star To grace his gorgeous reign, as bright as they: Through the blue fields afar, Unseen, they follow in his flaming way : Many a bright lingerer, as the eve grows dim, Tells what a radiant troop arose and set with him. And thou dost see them rise, Star of the Pole ! and thou dost see them set. Alone, in thy cold skies, Thou keep 'st thy old unmoving station yet, Nor join'st the dances of that glittering train, Nor dipp'st...