« 上一页继续 »
DAVY'S FIRST SAFETY
LAMP. The great Sir Humphry Davy, who, made so many wonderful discoveries in . science, conceived the first idea of his Safety-lamp when a mere boy. He was, very sorry to think of the poor miners who had to risk their lives down in the dark coal mines, and he thought that if he could invent a lamp, the flame of which should not be able to reach the dangerous gases which are found in mines, he should be doing useful work.' So he thought for a long time, and at. length he discovered that the flame of a candle would not pass through wire gauze, so that if a candle were surrounded by wire gauze it could not set light to the terrible “fire damp,” as the miners call the dangerous gas in the mine. The lamp in the picture is not exactly like the one now in use, for Davy improved his first invention, but it is on the same principle, and has saved the lives of many poor miners.
THE HAYFIELD. It was a capital day for making hay! There had not been a drop of rain for ever so long, and the sun shone so fiercely that it not only made the hay very dry, but likewise the mouths of the hay-makers,—so they said, at least, when Uncle Dick came into the field and he sent for a large can of beer for them. Uncle Dick lived in town, but he enjoyed the country very much, and used often to come down and see his farmerbrother and his little nephews and nieces. Here they are, all in the hayfield, tossing the hay over their Uncle. How good - tempered he looks! He pretends that he is a fine town gentleman, and does not like to be treated in such a way; but the children know better, and just now Harry stuffed both his pockets full of hay without his finding out anything about it. Kate means to take all the things out of his carpet-bag, and fill it with hay before he goes back to town.