Scientific Dialogues: Intended for the Instruction and Entertainment of Young People: in which the First Principles of Natural and Experimental Philosophy are Fully Explained, כרך 1J. Grigg, T. Desilver, 1829 |
מתוך הספר
תוצאות 1-5 מתוך 23
עמוד 40
... poles , and the distance from the centre to the poles is about eighteen or nineteen miles less than its distance from the centre to the equator , consequently , bodies ought to be something heavier at , and near the poles , than they ...
... poles , and the distance from the centre to the poles is about eighteen or nineteen miles less than its distance from the centre to the equator , consequently , bodies ought to be something heavier at , and near the poles , than they ...
עמוד 52
... pole , with weights at each end , across the rope on which they dance , keeping their eyes fixed on some object , parallel to the rope , by which means they know when their centre of gravity declines to 52 MECHANICS .
... pole , with weights at each end , across the rope on which they dance , keeping their eyes fixed on some object , parallel to the rope , by which means they know when their centre of gravity declines to 52 MECHANICS .
עמוד 53
... pole , they are enabled to keep the centre of gravity over the base , narrow as it is . It is not however rope - dancers only that pay attention to this principle , but the most common actions of the people in gene- ral are regulated by ...
... pole , they are enabled to keep the centre of gravity over the base , narrow as it is . It is not however rope - dancers only that pay attention to this principle , but the most common actions of the people in gene- ral are regulated by ...
עמוד 75
... poles upon which the seats were fixed ? Father . Yes , the greater the distance at which these seats were placed from the centre of mo- tion , the greater was the space which the little boys and girls travelled for their half - penny ...
... poles upon which the seats were fixed ? Father . Yes , the greater the distance at which these seats were placed from the centre of mo- tion , the greater was the space which the little boys and girls travelled for their half - penny ...
עמוד 87
... pole between them , the ability of each may be consulted by placing the burden as much nearer to the stronger man , as his strength is greater than that of his partner . Emma . Which would you call the prop in this Case ? Father . The ...
... pole between them , the ability of each may be consulted by placing the burden as much nearer to the stronger man , as his strength is greater than that of his partner . Emma . Which would you call the prop in this Case ? Father . The ...
מהדורות אחרות - הצג הכל
מונחים וביטויים נפוצים
advantage gained angle appear astronomers attraction of cohesion attraction of gravitation axis ball body called centre of gravity centre of motion Charles clock consequently CONVERSATION days and nights degrees diameter distance diurnal motion earth ecliptic Emma Ephemeris equal equator explain fall Father feet fixed stars force fulcrum full moon globe greater half heat heavens hemisphere hence Herschel horizon inch inclined plane James journey Jupiter kind law of motion length less lever light line of direction marble Mars matter means mechanical power Mercury millions of miles minutes moon's move nearer observe orbit papa perpendicular philosophy planets polar circles poles pound pound weight principle proportion pulleys rays reason retrograde motion revolves rise rotation round the sun Saturn screw seen sidereal day Solar System space passed sun's superior planets suppose surface tides tion turn Tutor velocity Venus visible wedge weight
קטעים בולטים
עמוד 223 - 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.
עמוד 206 - 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.
עמוד 75 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
עמוד 250 - When even at last the solemn hour shall come, And wing my mystic flight to future worlds, I cheerful will obey; there, with new powers, Will rising wonders sing. I cannot go Where universal love not smiles around, Sustaining all yon orbs, and all their suns; From seeming evil still educing good, And better thence again, and better still, In infinite progression.
עמוד 120 - 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.
עמוד 188 - 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.
עמוד 239 - 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, The guilty nations tremble.
עמוד 198 - Were slunk, all but the wakeful nightingale ; She all night long her amorous descant sung; Silence was pleas'd: now glow'd the firmament With living sapphires; Hesperus, that led The starry host, rode brightest, till the moon Rising in clouded majesty, at length Apparent queen unveil'd her peerless light, And o'er the dark her silver mantle threw.
עמוד 60 - It is a law of nature, with respect to matter, that every motion and change of motion is proportional to the force impressed, and in the direction of that force.
עמוד 196 - 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...