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"Recurring to what had been done more than half a century ago by Hertz, when he concentrated electric waves upon a focal point by means of a concave mirror," said Hall, "I saw that the key I wanted lay in an extension of these experiments.
They are held together by thin coats of bitumen, and in order to give them greater strength their sides are slightly concave. Their interiors are filled in with fragments of broken pottery, which gave considerable support while they in no way hindered the passage of the water.
The blaze refracted from the concave and blackened surface of the bark, cast a brilliant light over the semicircle ahead of us, at the same time that we, behind the screen of birch-bark, were hid in utter darkness. I had heard that the swans, instead of being frightened by torch-light, only became amazed, and even at times curious enough to approach it, just as the deer and some other animals do.
Pansy was not in the first of the rooms, a large apartment with a concave ceiling and walls covered with old red damask; it was here Mrs. Osmond usually sat though she was not in her most customary place to-night and that a circle of more especial intimates gathered about the fire.
And the engineer added an emphatic "Ja!" of agreement. "Not as primitive as all that," corrected Jarvis. "The sunlight focused on a queer cylinder in the center of a big concave mirror, and they drew an electric current from it. The juice worked the pumps." "A t'ermocouple!" ejaculated Putz. "That sounds reasonable; you can judge by the pictures. But the power-plant had some queer things about it.
In the construction of his telescope Galileo made use of a convex and a concave lens; but shortly after this Kepler invented an instrument in which both the lenses used were convex. This telescope gave a much larger field of view than the Galilean telescope, but did not give as clear an image, and in consequence did not come into general use until the middle of the seventeenth century.
Shadows of branches lie here upon the surface itself, received by the greenish water dust. Round the curve on the concave and lee side of the river, where the wind drives the wavelets direct upon the strand, there are little beaches formed by the undermining and fall of the bank.
I ordered a fire to be lighted, and fixing one of our iron plates, which was round in form, and rather concave, on two stones placed on each side of the fire, I covered it with the flour which we took from the bag with a small wooden shovel. It soon formed a solid cake, which we turned, that it might be equally baked.
"When the cover was taken off and used as a saucer it had on its concave side: 'A child should always say what's true And speak when he is spoken to, And behave mannerly at table, At least as far as he is able. "Tamaitai had had a very critical operation during the previous autumn, and was still comparatively invalided with the effects of it.
Clark found his son trying to make a telescope out of the pieces of a bell, he became interested in telescopes. He studied all about them in order to help the boy with his work. He helped his son grind the metal disc into a concave mirror; that is, a mirror that is a little dish-shaped.
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