Lectures at Home: Discovery and Manufacture of Glass, Lenses and Mirrors, the Structure of the Eye |
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Page 51
... side by side , and you may observe it distinctly : the plate - glass is considerably darker than the other . This is produced by the addition of a metal called manganese , which also increases the reflecting power of the glass : this is ...
... side by side , and you may observe it distinctly : the plate - glass is considerably darker than the other . This is produced by the addition of a metal called manganese , which also increases the reflecting power of the glass : this is ...
Page 62
... sides would have fallen in , and then they would not have afforded a passage for your needles . When the sand has been shaken out of the hollows , the beads are put into other sieves of different degrees of fineness , that they may be ...
... sides would have fallen in , and then they would not have afforded a passage for your needles . When the sand has been shaken out of the hollows , the beads are put into other sieves of different degrees of fineness , that they may be ...
Page 67
... side ! This circumstance led to the conclusion , that such pictures must have been formed by joining slender threads of glass , in the way I have mentioned , and afterwards subjecting them to heat , so powerful as almost to melt them ...
... side ! This circumstance led to the conclusion , that such pictures must have been formed by joining slender threads of glass , in the way I have mentioned , and afterwards subjecting them to heat , so powerful as almost to melt them ...
Page 74
... sides of this urn . The representation of Death was one of the first scenes in the Mysteries . The central figure in ... side figures of the group are a man and woman , the emble- matic representatives of the human race ; they both seem ...
... sides of this urn . The representation of Death was one of the first scenes in the Mysteries . The central figure in ... side figures of the group are a man and woman , the emble- matic representatives of the human race ; they both seem ...
Page 75
... side of the vase , and examine the representation of the life after death . The ancient heathens supposed that the habitation of the spirits of the dead was beneath the surface of the earth . This was the dominion of Pluto , the ...
... side of the vase , and examine the representation of the life after death . The ancient heathens supposed that the habitation of the spirits of the dead was beneath the surface of the earth . This was the dominion of Pluto , the ...
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Common terms and phrases
ACHROMATIC TELESCOPE Alexander Severus ancient appear Arnott basin beads beautiful beneath bright burning-glasses called camera-obscura casting contrived converge convex lens cool crown-glass crystalline lens dark deception discovery distance distinct Dollond eclipse ELEUSINIAN MYSTERIES employed eye-glass farther Father Scheiner feet FINDING THE LONGITUDE fish flint-glass focus Galileo glass globe Greenwich half bound heat HERCULANEUM Hutton instrument inverted Joyce Jupiter kinds of glass Lardner LECTURE lenses looking looking-glasses magnified means melted microscope moon Mosaic Mount Etna Mysteries object object-glass observe OPTICAL oven pass perceive person phantom phial pieces of glass plate of glass plate-glass PORTLAND VASE power of refraction prism produced pupil quicksilver rays of light rays proceeding reflected REFLECTING TELESCOPES refraction retina Roman round sand seems seen Septimius Severus shilling specimen substance suppose surface telescope thing tin-foil tion TRANSIT OF VENUS transparent tube window word
Popular passages
Page 202 - Thus with the year Seasons return, but not to me returns Day, or the sweet approach of even or morn, Or sight of vernal bloom, or summer's rose, Or flocks, or herds, or human face divine: But cloud instead, and ever-during dark Surrounds me, from the cheerful ways of men Cut off, and for the book of knowledge fair Presented with a universal blank Of nature's works, to me expunged and rased, And wisdom at one entrance quite shut out.
Page 18 - Dido pass ; Or held, by Solomon's own invitation, A torch at the great Temple's dedication.
Page 17 - Revisiting the glimpses of the moon, Not like thin ghosts, or disembodied creatures, But with thy bones and flesh, and limbs and features. Tell us, for doubtless thou canst recollect, To whom should we assign the Sphinx's fame ? Was Cheops or Cephrenes architect Of either pyramid that bears his name ? Is Pompey's pillar really a misnomer ? Had Thebes a hundred gates, as sung by Homer...
Page 20 - And standest undecayed within our presence, Thou wilt hear nothing till the Judgment morning, When the great trump shall thrill thee with its warning. Why should this worthless tegument endure, If its undying guest be lost...
Page 19 - Since first thy form was in this box extended We have, above ground, seen some strange mutations : The Roman empire has begun and ended, New worlds have risen, we have lost old nations; And countless kings have into dust been humbled, While not a fragment of thy flesh has crumbled.
Page 17 - Memnonium was in all its glory, And time had not begun to overthrow Those temples, palaces, and piles stupendous, Of which the very ruins are tremendous. Speak! for thou long enough hast acted dummy. Thou hast a tongue, - come, let us hear its tune; Thou'rt standing on thy legs above ground, mummy! Revisiting the glimpses of the moon, Not like thin ghosts or disembodied creatures, But with thy bones and flesh, and limbs and features.
Page 202 - Though hard and rare : thee I revisit safe, And feel thy sovran vital lamp ; but thou Revisit'st not these eyes, that roll in vain To find thy piercing ray, and find no dawn ; So thick a drop serene hath quenched their orbs, Or dim suffusion veiled.
Page 16 - AND thou hast walked about (how strange a story!) In Thebes's streets three thousand years ago, When the Memnonium was in all its glory, And time had not begun to overthrow Those temples, palaces, and piles stupendous, Of which the very ruins are tremendous!
Page 114 - Fair all the pageant, — but how passing fair The slender form which lay on couch of Ind ! O'er her white bosom strayed her hazel hair, Pale her dear cheek, as if for love she pined ; All in her night-robe loose she lay reclined...
Page 18 - Thou couldst develop — if that withered tongue Might tell us what those sightless orbs have seen — How the world looked when it was fresh and young, And the great deluge still had left it green; Or was it then so old that history's pages Contained no record of its early ages ? Still silent!