Conversations on Natural Philosophy: In which the Elements of that Science are Familiarly Explained, and Adapted to the Comprehension of Young PupilsLincoln & Edmands, 1826 - 252 من الصفحات |
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الصفحة 10
... Emily . I make no doubt of it , Mrs. B .; and pray begin by explaining why the earth requires no support ; for that is the point which just now most strongly excites my curiosity . Mrs. B. My dear Emily , if I am to attempt to give you ...
... Emily . I make no doubt of it , Mrs. B .; and pray begin by explaining why the earth requires no support ; for that is the point which just now most strongly excites my curiosity . Mrs. B. My dear Emily , if I am to attempt to give you ...
الصفحة 11
... Emily . I understand this perfectly . Liquids are in reality as substantial or as impenetrable as solid bodies , and they appear less so , only because they are more ea- sily displaced . Mrs. B. The air is a fluid differing in its ...
... Emily . I understand this perfectly . Liquids are in reality as substantial or as impenetrable as solid bodies , and they appear less so , only because they are more ea- sily displaced . Mrs. B. The air is a fluid differing in its ...
الصفحة 12
... Emily . No : certainly I cannot ; though these dimen- sions must , of course , vary extremely in different bodies . The length , breadth , and depth , of a box , or of a thimble , are very different from those of a walking - stick , or ...
... Emily . No : certainly I cannot ; though these dimen- sions must , of course , vary extremely in different bodies . The length , breadth , and depth , of a box , or of a thimble , are very different from those of a walking - stick , or ...
الصفحة 13
... Emily . Such as a piece of broken china or glass ? Mrs. B. Or the fragments of mineral bodies which are broken in being dug out of the earth , or decayed by the effect of torrents and other causes . The picturesque ef- fect of rock ...
... Emily . Such as a piece of broken china or glass ? Mrs. B. Or the fragments of mineral bodies which are broken in being dug out of the earth , or decayed by the effect of torrents and other causes . The picturesque ef- fect of rock ...
الصفحة 14
... Emily . But when I smell a flower , I see no vapour rise from it ; and yet I can perceive the smell at a con- siderable distance . Mrs. B. You could , I assure you , no more smell a flower , the odoriferous particles of which did not ...
... Emily . But when I smell a flower , I see no vapour rise from it ; and yet I can perceive the smell at a con- siderable distance . Mrs. B. You could , I assure you , no more smell a flower , the odoriferous particles of which did not ...
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angle angle of incidence appear astronomy atmosphere axis ball called camera obscura Caroline centre of gravity centrifugal force circle cohesive attraction concave mirror consequently convex mirror degrees diminished direction distance diurnal motion earth eclipse ecliptick effect Emily equal equator explain figure fixed stars focus force fulcrum geometry glass globe greater heat humour lens less lever liquids mechanical power mechanicks mercury meridian moon motion move Natural Philosophy nature object obliquely observe opaque body opposite opticks orbit particles passes pendulum perpendicular planets plate poles pressure produced properties proportion pulley pump rays fall rays of light re-action reflected rays reflecting telescope refraction represents resistance retina right line rise round the sun shadow shines situated solar solid bodies sonorous body sound space specifick gravity sphere spring sun's rays suppose surface tides tion tube understand vapour velocity vibrations weight whilst wind zodiack
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الصفحة 89 - Had in her sober livery all things clad; Silence accompanied, for beast and bird, They to their grassy couch, these to their nests, Were slunk, all but the wakeful nightingale; She all night long her amorous descant* sung; Silence was pleased: now...
الصفحة 2 - District Clerk's Office. BE IT REMEMBERED, that on the tenth day of August, AD 1829, in the fifty-fourth year of the Independence of the United States of America, JP Dabney, of the said district, has deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit...
الصفحة 101 - evidence of things not seen," in the fulness of Divine grace ; and was profound on this, the greatest concern of human life, while unable even to comprehend how the " inclination of the earth's axis to the plane of its orbit" could be the cause of the change of the seasons.
الصفحة 89 - Now came still evening on, and twilight gray Had In her sober livery all things clad : Silence accompanied; for beast and bird, They to their grassy couch, these to their nests Were slunk, all but the wakeful nightingale; She all night long her amorous descant sung...
الصفحة 89 - By shorter flight to the east, had left him there Arraying with reflected purple arid gold The clouds that on his western throne attend. -^Now came still evening. on, and twilight gray Had in her sober livery all things clad ; Silence accompanied; for beast and bird, They to their grassy couch, these to their nests I Were slunk, all but the wakeful nightingale...
الصفحة 137 - The lateral pressure is the result therefore of the pressure downwards, or the weight of the liquid above ; and consequently the lower the orifice is made in the vessel, the greater will be the velocity of the water rushing out of it.
الصفحة 70 - You will see by this figure (fig. 9.) that it is composed of two parts, the screw and the nut. The screw S is a cylinder, with a spiral protuberance coiled round it, called the thread: the nut N is perforated to contain the screw; and the inside of the nut has a spiral groove, made to fit the spiral thread of the screw.
الصفحة 87 - ... show that heat is produced by the sun's rays only when they act on a calorific medium: they are the cause of the production of heat, by uniting with the matter of fire which is contained in the substances that are heated...
الصفحة 140 - A piece of lead, let us say a cubic inch, for instance, would have less specific gravity in summer than in winter; for it would be more dense in the latter season. CAROLINE. • But, Mrs. B., if you compare the weight of equal quantities of different bodies, they will all be alike. You know the old saying, that a pound of feathers is as heavy as a pound of lead ! MRS.
الصفحة 215 - ... appear colourless or white. Sir Isaac Newton, to whom we are indebted for the most important discoveries respecting light and colours, was the first who divided a white ray of light, and found it to consist of an assemblage of coloured rays, which formed an image upon the wall, such as is exhibited, in which are displayed the following series of colours — red, orange, yellow, green, blue, indigo, and violet.