Systematic Education: Or Elementary Instruction in the Various Departments of Literature and Science; with Practical Rules for Studying Each Branch of Useful Knowledge, Volume 2Longman, Hurst, Rees, Orme, and Brown, 1815 - Education |
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Page 54
... object , ABC , fig . 6 , be placed beyond the focus F , of the convex glass def , some of the rays , which flow from every point of the object , on the side next the glass , will fall upon it ; and after passing through it , they will ...
... object , ABC , fig . 6 , be placed beyond the focus F , of the convex glass def , some of the rays , which flow from every point of the object , on the side next the glass , will fall upon it ; and after passing through it , they will ...
Page 55
... object , which will be inverted . Thus the rays Ad , Ae , Af , flowing from the point A , will converge in the space daf ; and by meeting at a , an image will be formed there of the point A. The rays Bd , Be , Bf , flowing from the ...
... object , which will be inverted . Thus the rays Ad , Ae , Af , flowing from the point A , will converge in the space daf ; and by meeting at a , an image will be formed there of the point A. The rays Bd , Be , Bf , flowing from the ...
Page 57
... object between the rays a b and ef , so that the image of the object would be formed at m , which point , as has been observed , is distant from the mirror equal to half the radius dm C of its concavity . The rays , which proceed from ...
... object between the rays a b and ef , so that the image of the object would be formed at m , which point , as has been observed , is distant from the mirror equal to half the radius dm C of its concavity . The rays , which proceed from ...
Page 58
... object . And ge- nerally when the object is more remote from the mirror than its centre C , the image will be less than the object , and will be situated between the object and the mirror : when the ob- ject is nearer than the centre of ...
... object . And ge- nerally when the object is more remote from the mirror than its centre C , the image will be less than the object , and will be situated between the object and the mirror : when the ob- ject is nearer than the centre of ...
Page 59
... object moves , the image will move the contrary way . Several other experiments of this kind will be found in almost all writers on this branch of science . The following may be mentioned , as very easy to be performed . Take a bottle ...
... object moves , the image will move the contrary way . Several other experiments of this kind will be found in almost all writers on this branch of science . The following may be mentioned , as very easy to be performed . Take a bottle ...
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acid Adam Smith affections agriculture alkalies ammonia Amphibia animals appear association attention become benevolence body bones called capital circumstances colour commerce common complex connected connexion consequences consists convex lens degree denominated derived direction dispositions earth ecliptic electricity employed excite exercise external feelings fluid genus glass habit happiness Hence human important increase individual influence instance kind labour laws manufactures means mental mental philosophy mind moon moral motion motive muscles nations Natural Philosophy nature nitric acid object obligation observed operations oxydes oxygen pains persons Philosophy planets pleasures population potash principles produce properties proportion proposition quadrupeds rays readers referred regard respect retina rule of duty sensation sense sensible shew simple ideas Sophisms species specific gravity substances sulphuric acid supposed surface syllogism term thought tion truth tube understanding vessel virtue wealth Wealth of Nations whole words writers
Popular passages
Page 441 - THE annual labour of every nation is the fund which originally supplies it with all the necessaries and conveniences of life which it annually consumes, and which consist always either in the immediate produce of that labour, or in what is purchased with that produce from other nations.
Page 354 - the doing good to mankind, in obedience to the will of God, and for the sake of everlasting happiness.
Page 478 - It is in this manner that money has become in all civilized nations the universal instrument of commerce, by the intervention of which goods of all kinds are bought and sold, or exchanged for one another.
Page 97 - When any substance was introduced into this arch, it instantly became ignited ; platina melted as readily in it as wax in the flame of a common candle ; quartz, the sapphire, magnesia, lime, all entered into fusion...
Page 492 - Taking the whole earth, instead of this island, emigration would, of course, be excluded; and, supposing the present population equal to a thousand millions, the human species would increase as the numbers 1, 2, 4, 8, 16, 32, 64, 128, 256, and subsistence as 1, 2, 3, 4, 5, 6, 7, 8, 9. In two centuries the population would be to the means of subsistence as 256 to 9; in three centuries as 4096 to 13, and in two thousand years the difference would be almost incalculable.
Page 321 - MORAL Philosophy, Morality, Ethics, Casuistry, Natural Law, mean all the same thing ; namely, that science which teaches men their duty and the reasons of it.
Page 113 - Aries the Ram, Taurus the Bull, Gemini the Twins, Cancer the Crab, Leo the Lion, Virgo the Virgin, Libra the Balance, Scorpio the Scorpion, Sagittarius the Archer, Capricornus the Goat, Aquarius the Waterbearer, and Pisces the Fishes...
Page 495 - I should propose a regulation to be made, declaring that no child born from any marriage taking place after the expiration of a year from the date of the law, and no illegitimate child born two years from the same date, should ever be entitled to parish assistance.
Page 489 - It is in this manner that the demand for men, like that for any other commodity, necessarily regulates the production of men, quickens it when it goes on too slowly, and stops it when it advances too fast.
Page 475 - Labour was the first price, the original purchase-money that was paid for all things. It was not by gold or by silver, but by labour, that all the wealth of the world was originally purchased ; and its value, to those who possess it, and who want to exchange it for some new productions, is precisely equal to the quantity of labour which it can enable them to purchase or command.