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, 1828 - 318 σελίδες |
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Σελίδα x
... Convex Reflectors , 34. Colours . The Prism . Page . 69 - 71 73 35. The Rainbow , Halo , and Parhelia , 75 36. Structure of the Eye . Angle of Vision , 78 37. Optical Instruments . Spectacles . Microscopes , 38. Microscopic Discoveries ...
... Convex Reflectors , 34. Colours . The Prism . Page . 69 - 71 73 35. The Rainbow , Halo , and Parhelia , 75 36. Structure of the Eye . Angle of Vision , 78 37. Optical Instruments . Spectacles . Microscopes , 38. Microscopic Discoveries ...
Σελίδα 60
... convex , or stands higher in the middle than at the sides , it is a sign the mercury is then in a rising state ; but if the surface be concave , or hollow in the middle , it is then sinking . In very hot weather , the falling of the ...
... convex , or stands higher in the middle than at the sides , it is a sign the mercury is then in a rising state ; but if the surface be concave , or hollow in the middle , it is then sinking . In very hot weather , the falling of the ...
Σελίδα 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 ...
Σελίδα 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 . 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 . All the parallel rays of the sun which pass through a ...
Σελίδα 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 ...
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Άλλες εκδόσεις - Προβολή όλων
The Literary and Scientific Class Book: Embracing the Leading Facts and ... Levi Washburn Leonard,John Platts Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
acid angle animals appear atmospheric air attraction axis beautiful birds called caloric carbon carbonic acid centre colour combined combustion comets common conductor consists convex convex lens copper dark Describe diameter distance diurnal motion earth ecliptic equal equator fall fixed flowers focus force glass glottis gold gravity heavens hundred hydrogen hydrogen gas inches insects iron Jupiter kind lens LESSON Linnæus machine magnet means mercury meridian metals microscope miles minerals mirror 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 sun's surface telescope tion tube Uranus valve vapour various vegetable vessel vibrations weight
Δημοφιλή αποσπάσματα
Σελίδα 264 - 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.
Σελίδα 243 - 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...
Σελίδα 264 - 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.
Σελίδα 76 - And yet, fair bow, no fabling dreams, But words of the Most High, Have told why first thy robe of beams Was woven in the sky.
Σελίδα 77 - 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.
Σελίδα 118 - ... 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.
Σελίδα 243 - As beasts excel cold rocks and brambles rude ; Men, who their duties know, But know their rights, and, knowing, dare maintain...
Σελίδα 230 - How many merchants and carriers, besides, must have been employed in transporting the materials from some of those workmen to others who often live in a very distant part of the country ? How much commerce and navigation in particular, how many ship-builders, sailors, sail-makers, rope-makers, must have been employed in order to bring together the different drugs made use of by the dyer, which often come from the remotest corners of the world...
Σελίδα 100 - 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.
Σελίδα 240 - A strong sense of the value and blessings of union induced the people at a very early period to institute a federal government to preserve and perpetuate it. They formed it almost as soon as they had a political existence; nay, at a time when their habitations were in flames, when many of...