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The little sharply lighted and heated point to which the light-rays can be brought is the focus of the lens, and the distance it lies behind the lens is called the focal distance. The thicker the lens, or burning-glass, is in the middle, the shorter its focal distance, and the more strongly it will magnify.
They seem ordinary enough but stop! The third from the bottom; it has a peculiar depth and clearness. It might very well be a lens a burning-glass, to use the old-fashioned term. How close has the sun drawn to this particular bull's-eye? To-morrow I will take note. "March 20. At high noon the sun has reached within a hair's-breadth of the third bull's-eye from the bottom.
This belief was strengthened, when, on entering the room, he brought down fire from the heavens by means of his burning-glass. We soon convinced them, however, that we were merely mortals; and after one of our chiefs had explained our history and objects, we all smoked together in great harmony."
Kennedy also told me that the ship was inside, close up to the mainland; I went on a little way, and saw the ship and boat; I met close up here two black gins and a good many piccanninies; one said to me "powad, powad;" then I asked her for eggs, she gave me turtles' eggs, and I gave her a burning-glass; she pointed to the ship which I had seen before; I was very frightened of seeing the black men all along here; and when I was on the rock cooeying, and murry murry glad when the boat came for me.
But as he looked and harkened he was enlightened. A great tear of resinous gum had caught and hardened in a fork of the branches, and the sun's rays falling on and through this were concentrated as if by a burning-glass. The fiery point had stung him. He broke away the cause of mischief, and then looked about him with a new understanding.
At last, after holding out as long as possible, the poor boy made up his mind to eat a little. Then he thought, "If I could only cook them; oh! for only one small lump of live coal from the camp fire on " The thought was checked abruptly, for he suddenly remembered that he had a burning-glass in his trousers pocket.
I saw that it would soon be necessary again to camp, so, that I might not have to pass the night without a fire, I endeavoured to obtain a light by means of my burning-glass, before the sun should descend too low.
At nine o'clock our barometer informed us that we had ascended to the height of 6,000 feet. M. de Verley took advantage of this elevation to put some touch wood to a burning-glass 18 lines in diameter, and the touch wood lighted immediately." The aeronauts decided to direct their course for Dijon.
Think of him, I say, and of the concentrated gaze of good society through its thousand eyes, all confluent, as it were, in one great burning-glass of ice that shrivels its wretched object in fiery torture, itself cold as the glacier of an unsunned cavern! No, there will be angels of good-breeding then as now, to shield the victim of free institutions from himself and from his torturers.
For many days after this, while Peterkin and Jack were busily employed in building a little boat out of the curious natural planks of the chestnut-tree, I spent much of my time in examining with the burning-glass the marvellous operations that were constantly going on in my tank.
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