Download A Treatise on Astronomy by Sir John Frederick William Herschel PDF

By Sir John Frederick William Herschel

ISBN-10: 0511694326

ISBN-13: 9780511694325

Astronomer and thinker Sir John Herschel (1792-1871), the son of William and the nephew of Caroline, released his 1833 Treatise on Astronomy within the 'Cabinet Cyclopaedia' sequence of which the 1st quantity were his tremendously profitable initial Discourse at the learn of traditional Philosophy. he's considered as the founding father of the philosophy of technology, and made contributions in lots of fields together with arithmetic, the newly came upon technique of images, and the botany of southern Africa, which he studied whereas making astronomical observations of the southern hemisphere, and the place he used to be visited via Darwin and Fitzroy at the Beagle voyage. It used to be in spite of the fact that because the average successor to his father's astronomical reports that he's top remembered, and this ebook, that is written for the lay individual, areas robust emphasis at the value of exact statement and on keeping off preconceptions or hypotheses no longer according to such remark.

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CHAP. I. GENERAL FORM OP THE EARTH. 15 the sun, moon, and stars can pass; and that side must, at least, be so far like what we see, that it must have a sky and sunshine, and a day when it is night to us, and vice versd ; where, in short, —" redit a nobis Aurora, diemque reducit. " Georg. (19-) As soon as we have familiarized ourselves with the conception of an earth without foundations or fixed supports—existing insulated in space from contact of every thing external, it becomes easy to imagine it in motion — or, rather, difficult to imagine it otherwise; for, since there is nothing to retain it in one place, should any causes of motion exist, or any forces act upon it, it must obey their impulse.

CHAP. I. thirtieth of the whole mass of the atmosphere: —that at 10,600 feet of perpendicular elevation (which is rather less than that of the summit of JEtna*) we have ascended through about one third; and at 18,000 feet (which is nearly that of Cotopaxi) through one half the material, or, at least, the ponderable, body of air incumbent on the earth's surface. From the progression of these numbers, as well as, a priori, from the nature of the air itself, which is compressible, i. e. capable of being condensed, or crowded into a smaller space in proportion to the incumbent pressure, it is easy to see that, although by rising still higher we should continually get above more and more of the air, and so relieve ourselves more and more from the pressure with which it weighs upon us, yet the amount of this additional relief, or the ponderable quantity of air surmounted, would be by no means in proportion to the additional height ascended, but in a constantly decreasing ratio.

CHAP. I. CHANGE OF LOCAL SITUATION. 37 which he occupies should be carried round, and presented towards a different region of space; he would never obtain a sight of almost one half the objects external to our atmosphere. But if any of these cases be supposed, more, or all, may come into view according to the circumstances. ) A traveller, for example, shifting his locality on our globe, will obtain a view of celestial objects invisible from his original station, in a way which may be not inaptly illustrated by comparing him to a person standing in a park close to a large tree.

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