Boy's Own Book: A Complete Encyclopedia of All Athletic, Scientific, Recreative, Outdoor and Indoor Exercises and Diversions

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World, 1875 - 522 pages
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Page 107 - If 100 stones are placed in a straight line, at the distance of a yard from each other ; how far must a person travel, to bring them one by one to a box placed at the distance of a yard from the first stone 1 QUEST.
Page 146 - That no mistake may be made, each party should repeat to himself the letters of the alphabet in the order of the blows. THE MIRACULOUS SHILLING. Provide a round box, the size of a large snuff-box, and likewise eight other boxes, which will go easily into each other, letting the least of them be of the size to hold a shilling. Observe that all these boxes must shut so freely that they may all be closed at once, by the covers accurately fitting within each other. Previously to commencing your performance,...
Page 34 - ... be seen. The same effect, Dr. Wollaston has shown, may be produced by looking along the side of a red-hot poker at a word or object ten or twelve feet distant. At a distance less than three-eighths of an inch from the line of the poker, an inverted image was seen ; and within and without that, an erect image. The...
Page 40 - Colors produced by the unequal ,'lttiim of L/ight upon the Eyes. If we hold a slip of white paper vertically, about a foot from the eye, and direct both eyes to an object at some distance beyond it, so as to see the slip of paper double, then, when a candle is brought near the right eye, so as to act strongly upon it, while the left eye is protected from its light, the...
Page 91 - Pyrmont water. In consequence of the weight of the carbonic acid gas, it may be lifted out in a pitcher, or bottle, which, if well corked, may be used to convey it to great distances, or it may be drawn out of a vessel by a cock like a liquid. The effects produced by pouring this invisible fluid from one vessel to another, have a very singular appearance ; if a candle or small animal be placed in a deep vessel, the former becomes extinct, and the latter expires in a few seconds, after the carbonic...
Page 152 - ... may fix the whole in a frame. While the mixture between the glasses is cold, the picture will be quite concealed, but become transparent when held to the fire ; and as the composition cools, it will gradually disappear. Artificial Lightning. PROVIDE a tin tube that is larger at one end than it is at . , the other, and in which there are several holes. Fill this tube with powdered resin ; and when it is shook over the ' flame of a torch, the reflection will produce the exact , appearance of lightning....
Page 127 - ... be supplied from the tube, the discs must be separated with a velocity as much less than that of the blast, as the column required between them is greater than that yielded by the tube; and yet the air cannot be supplied from any other source, unless a deficit of pressure be created between the discs, unfavourable to their separation.
Page 136 - SOLIDITY OF AIR. Provide a glass tube, open at each end; close the upper end by the finger, and immerse the lower one in a glass of water, when it will be seen that the air is material, and occupies its own space in the tube, for it will not permit the water to enter it until the finger is removed, when the air will escape, and the water rise to the same level in the inside as on the outside of the tube.
Page 127 - Supposing the diameter of the discs of card to be to that of the hole as 8 to 1, the area of the former to the latter must be as 64 to 1. Hence, if the discs were to be separated (their surfaces remaining parallel) with a velocity as great as that of the air blast, a column of air must meanwhile be interposed...
Page 106 - ... one farthing for the first nail, two for the second, four for the third, and so on to the twenty-fourth.

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