Home Teachings in Science

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F. Warne and Company - Fathers and sons - 158 pages
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Page 88 - Such, for a few hours, was the mingled roar of the hurricane above, of the waves around, and of the incessant peals of thunder, that no human voice could be heard, and amidst the general consternation, even the trumpet sounded in vain. In that awful night, but for the little tube of mercury which had given warning, neither the strength of the noble ship, nor the skill and energies of the commander, could have saved one man to tell the tale. On the following morning the wind was again at rest, but...
Page 88 - In that awful night, but for the little tube of mercury which had given the warning, neither the strength of the noble ship, nor the skill and energies of the commander, could have saved one man to tell the tale.
Page 72 - do you think that difficult to understand, Fred? I know the air presses against the sails of our boat and pushes it along, and against the sails of the windmill too. I do not think that is difficult to understand or remember." " When papa," said Fred, " was talking to me about the pressure of the air, I thought of the windmill, and the sails of the ships too; but still that is not the proper explanation of the pressure of the air, for the air presses on everything, not only when the wind blows but...
Page 72 - ... face, because you press against the air in running. I tell you what I think the pressure of the air is something like, George. Water, you know, is heavy; and in the great sea, in the rivers and in the ponds, it presses on the stones, the fish, and the weeds, whether there is a storm or whether there is a calm. It does not signify in the least whether the wind blow or not, the water presses with the same weight on the different things in the water.
Page 68 - That is called the barrel," replied his brother; " though you see, George, it is more like two quart pots put one above another than a common barrel, which is thicker in the middle than at the top and bottom. When we move the handle of the pump up and down, the bucket moves up and down inside the barrel which it is made to fit." "But I wonder the leather round the bucket does not make it stick fast," said George, " because when leather is wetted, it swells and takes more room.
Page 73 - I know that water is heavy, for a pail of water weighs a good deal, but does air weigh anything ? " "Yes, it does weigh something, but not nearly so much as water. If we had a pipe thirty feet high filled with water, and another pipe of the same size that was thirty miles high filled with nothing but air, the water in one pipe, and the air in the other, would weigh nearly alike.
Page 46 - That part of the country was then much inhabited by coopers ; and one of the men, when retiring from work in the evening, placed a new tub under a dropping spring, to try if it would hold water, and when he came in the morning he found it so heavy that he could scarcely move it. On examination, he found a shining ponderous fluid at the bottom, which proved to be quicksilver.
Page 42 - How do they get the quicksilver into the tube, papa?" said George; "I thought quicksilver was a metal, and are not all metals solid like iron? You said just now that fluids showed the difference of heat much better than solid substances." " Yes, so I did, George," replied his father ; " but quicksilver, although a metal, is in our climate a fluid. Near the North Pole it becomes as hard as any other metal, and can be beaten with a hammer, and drawn out without breaking. But in the temperate and hot...
Page 73 - I think I can understand now how it is. I draw the water from a cup into my mouth through a straw; I have often done that till I have quite emptied the cup. I somehow draw the air out of the straw, and the air outside the straw presses on the surface of the water in the cup, and 48 pushes it into the straw. But how does the pump, Fred, draw the air out of the pipe ? " "Why, first of all, suppose, (q) George, the pipe has no water in it," said Fred, " and suppose the bucket at the lower part of the...
Page 67 - I should think there must be something the matter with the pump," said Fred; " we will see if we can find out." " But," said George, " how can we find out what is the matter, when we know nothing about the different parts of the pump. I have never seen the inside, have you ? " " Yes; I have seen the inside two or three times...

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