Of mechanics and astronomyJ. Grigg, T. Desilver, E. Littel, Towar & Hogan, and Kimber & Sharpless, 1829 |
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Page vi
... lever , the wedge , and the pulley , but most people perceive that the notions which they have of their respective uses are unsatisfactory and indistinct , and many endeavour , at a late period of life , to acquire a scientific and ...
... lever , the wedge , and the pulley , but most people perceive that the notions which they have of their respective uses are unsatisfactory and indistinct , and many endeavour , at a late period of life , to acquire a scientific and ...
Page
... lever , the wedge , and the pulley , but most people perceive that the notions which they have of their respective uses are unsatisfactory and indistinct , and many endeavour , at a late period of life , to acquire a scientific and ...
... lever , the wedge , and the pulley , but most people perceive that the notions which they have of their respective uses are unsatisfactory and indistinct , and many endeavour , at a late period of life , to acquire a scientific and ...
Page 75
... of mechanics . There are six mechanical powers . The lever ; the wheel and axle ; the pulley ; the inclined plane ; the wedge ; and the screw . Emma . Why are they called mechanical powers ? Father MECHANICAL POWERS . 75.
... of mechanics . There are six mechanical powers . The lever ; the wheel and axle ; the pulley ; the inclined plane ; the wedge ; and the screw . Emma . Why are they called mechanical powers ? Father MECHANICAL POWERS . 75.
Page 78
... other parts move about it . Take the poker and stir the fire ; now that part of the bar on which the poker rests is a fulcrum , for the poker moves upon it as a centre , CONVERSATION XV . Of the Lever . Father . We 78 MECHANICS .
... other parts move about it . Take the poker and stir the fire ; now that part of the bar on which the poker rests is a fulcrum , for the poker moves upon it as a centre , CONVERSATION XV . Of the Lever . Father . We 78 MECHANICS .
Page 79
... lever , and the point c the fulcrum or centre of motion , Now , it is evident , if the lever turn on its centre of motion c , so that A comes into the position a ; B at the same time must come into the position b . If both the arms of the ...
... lever , and the point c the fulcrum or centre of motion , Now , it is evident , if the lever turn on its centre of motion c , so that A comes into the position a ; B at the same time must come into the position b . If both the arms of the ...
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Common terms and phrases
24 hours angle annual motion appear Aries astronomers attraction of cohesion axis body called Capricorn centre of gravity centre of motion Charles clock consequently CONVERSATION darkness days and nights degrees diameter distance diurnal motion earth earth's orbit eclipse Emma enlightened equal equator explain fall Father feet figure fixed stars force fulcrum full moon globe greater half harvest moon heat heavens hemisphere hence Herschel horizon inch inclined plane inhabitants James Julius C¿sar larger Leap-Year length less lever Libra light matter mechanical power Mercury millions of miles minutes moon's move nearer observe parallel perpendicular planets Plate VII polar circles poles pound pulleys rays revolves rise rotation round the sun satellite Saturn seasons seen shadow shine sidereal day solar summer sun and earth sun's supposed surface synodical month tance tides tion tropic tropic of Cancer tropic of Capricorn turn Tutor velocity Venus vertical visible weight winter
Popular passages
Page 177 - Amid the radiant orbs, That more than deck — that animate — the sky, The life-infusing suns of other worlds ; Lo ! from the dread immensity of space Returning, with accelerated course, The rushing comet to the Sun descends ; And as he sinks below the shading earth, With awful train projected o'er the heavens, 1710 The guilty nations tremble.
Page 161 - On earth join all ye creatures to extol Him first, him last, him midst, and without end. Fairest of stars, last in the train of night, If better thou belong not to the dawn, Sure pledge of day, that crown'st the smiling morn With thy bright circlet, praise him in thy sphere, While day arises, that sweet hour of prime.
Page 144 - Less than archangel ruined, and the excess Of glory obscured ; as when the sun, new risen, Looks through the horizontal misty air Shorn of his beams, or from behind the moon, In dim eclipse, disastrous twilight sheds On half the nations, and with fear of change Perplexes monarchs.
Page 109 - Of thirty years, to Mercury, whose disk Can scarce be caught by philosophic eye, Lost in the near effulgence of thy blaze.
Page 109 - One sun by day, by night ten thousand shine ; And light us deep into the DEITY.
Page 126 - 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.
Page 41 - These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 86 - To ask or search I blame thee not, for heaven Is as the book of God before thee set, Wherein to read his wondrous works, and learn His seasons, hours, or days, or months, or years.
Page 28 - If the force with which it strikes the air below it, is equal to the weight of its body, then the re-action of the air upwards is likewise equal to it, and the bird being acted upon by two equal forces in contrary directions, will rest between them. If the force of the stroke is greater than its weight, the bird will rise with the difference of these two forces ; and if the stroke be less than its weight, then it will sink with the difference.
Page 134 - But opposite in levell'd west was set His mirror, with full face borrowing her light From him, for other light she needed none In that aspect, and still that distance keeps Till night...