Of mechanics and astronomyH.C. Carey & I. Lea, M'Carty & Davis, Kimber & Sharpless, Lydia R. Bailey, Benjamin &Thomas Kite, Bennett & Walton, Marot & Walter, and Anthony Finley, 1825 - Science |
From inside the book
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Page 76
... power ten - fold , but it is at the expense of time . Or , in other words , you are enabled to do that with one effort in ten minutes , which you could have done in ten separate efforts in the same time . Emma . The importance of mechanics ...
... power ten - fold , but it is at the expense of time . Or , in other words , you are enabled to do that with one effort in ten minutes , which you could have done in ten separate efforts in the same time . Emma . The importance of mechanics ...
Page 79
... power is gained , time must be lost : " therefore , no time being lost by a lever of this kind , there can be no power gained . Charles . Why then is it called a mechanical power ? Father . Strictly speaking perhaps it ought not to be ...
... power is gained , time must be lost : " therefore , no time being lost by a lever of this kind , there can be no power gained . Charles . Why then is it called a mechanical power ? Father . Strictly speaking perhaps it ought not to be ...
Page 91
... power , but the spaces passed over are very dif- ferent ; that which the power passes through , being as much greater as that passed by the weight , as the length of the distance of the power from the prop , is greater than the distance ...
... power , but the spaces passed over are very dif- ferent ; that which the power passes through , being as much greater as that passed by the weight , as the length of the distance of the power from the prop , is greater than the distance ...
Page 95
... mechanical power might be considered as a lever of the first kind . Father . I did ; and if you conceive the wheel and axis ( Fig . 22. ) to be cut through the middle in the direction A B ; F G B ( Plate 111. Fig . 23. ) will represent ...
... mechanical power might be considered as a lever of the first kind . Father . I did ; and if you conceive the wheel and axis ( Fig . 22. ) to be cut through the middle in the direction A B ; F G B ( Plate 111. Fig . 23. ) will represent ...
Page 96
... mechanical power , the pul- ley , may be likewise explained on the principle of the lever . The line A B ( Plate Iv . Fig 24. ) may be conceived to be a lever , whose arms A C and B c are equal , and c the fulcrum , or centre of motion ...
... mechanical power , the pul- ley , may be likewise explained on the principle of the lever . The line A B ( Plate Iv . Fig 24. ) may be conceived to be a lever , whose arms A C and B c are equal , and c the fulcrum , or centre of motion ...
Common terms and phrases
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 Father feet figure fixed stars force fulcrum full moon globe greater heat heavens hemisphere hence Herschel horizon inch inclined plane inhabitants James journey Jupiter kind law of motion length less lever light line of direction marble Mars matter means mechanical powers Mercury millions of miles minutes moon's move multiplied nearer observe orbit papa 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 supposed surface tides tion turn Tutor velocity Venus visible wedge weight
Popular passages
Page 172 - 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.
Page 96 - 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 178 - 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 194 - 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 160 - 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 51 - 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 158 - I do : twice only in the year, a line drawn' from the centre of the sun to that of the earth passes through those points where the equator and ecliptic cross one another; at all other times,- it passes through some other part of that oblique circle, which is represented on the globe by the ecliptic line. Now when it passes through the equator or the tropics, which are...
Page 194 - Lebanon's extended wood Was destin'd only for his walk and food ; The vilest cockle, gaping on the coast That rounds the ample seas, as well may boast The craggy rock projects above the sky, That he in safety at...
Page 191 - Even in the depth of polar night, they find A wondrous day; enough to light the chase, Or guide their daring steps to Finland fairs.
Page 220 - How distant some of these nocturnal suns ! So distant (says the sage) 'twere not absurd To doubt if beams, set out at Nature's birth, Are yet arrived at this so foreign world, Though nothing half so rapid as their flight.