Scientific amusements for young people (Google eBook)

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Page 53 - Whose fountain who shall tell ? before the sun, Before the heavens thou wert, and at the voice Of God, as with a mantle, didst invest The rising world of waters dark and deep, Won from the void and formless infinite.
Page 51 - It is made of saltpetre, two pounds, sulphur one pound, and lamp-black three quarters of a pound, incorporated thoroughly together ; it should then be put into cases about six inches in length, but not driven very hard. This composition is very difficult to mix. The saltpetre and brimstone must be first sifted together, then put into a marble mortar, and the lamp-black added to them ; incorporate the ingredients with a wooden pestle, till the mixture appears of a dark gray...
Page 122 - ... the sum of the addition, the remainder of the subtraction, the product of the multiplication, and the quotient of the division be all equal...
Page 98 - Fig. 68. vertical line, let the bar B be rubbed with the lower end L of the tongs, from the marked end of the bar to its upper end, about ten times on each side of it. By this means the bar B will receive as much magnetism as will enable it to lift a small key at the marked end; and this...
Page 35 - Let six drams of a saturated solution of pure silver in nitric acid, and four drams of a similar solution of mercury in the same acid, be diluted with five ounces of distilled water, and poured into a small decanter or glass phial ; then compose an amalgam, by mixing one part of finely-divided silver with seven parts of mercury, and place a small lump of it at the bottom of the bottle, which must be kept quite still. In a short time, the surface of the amalgam will be covered with minute filaments...
Page 73 - ... on the opposite wall of the room, an oblong image will be displayed, consisting of the seven colours of the rainbow, red, orange, yellow, green, blue, indigo, and violet. This image is called the solar spectrum. If the hole in the shutter...
Page 115 - John, who is 22, tells George, who is some years older, that he can find out the difference in their ages ; he therefore deducts in his mind 22 from 99, and the difference, 77, he tells George to add to his own age ; to take away the first figure from the sum so obtained, and to add it to the last figure ; the last amount gained being the difference between their respective ages. Thus, the difference between John's age and 99, is 77 To which George adding his age . . 35 produces a total of . .112...
Page 117 - The number 3 should be placed in the same diagonal line ; but as there is no room in the square, you are to place it in that part it would occupy if another square were placed under this.
Page 66 - ... convex lens is exactly where the centre of the sphere would be, of which the surface of the lens is a portion ; consequently, in proportion to the convexity of the lens, so will the nearness of its focus be, as it then forms a part of a smaller sphere. When the light proceeding from all points of any object placed before a lens is collected at a certain point beyond it, and received on a white screen or other medium in a darkened room, it produces the well-known effects of the magic lantern,...
Page 118 - A country woman, carrying eggs to a garrison where she had three guards to pass, sold at the first, half the number she had and half an egg more ; at the second, the half of what remained and half an egg more ; at the third the half of the remainder and half an egg more ; when she arrived at the market-place she had three dozen still to sell. How was this possible without breaking any...

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