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To solar light, an artificial one has been preferred. D'Acquapendentus' bottle has given way to the convex lens, and to concave, spherical, and parabolic mirrors, etc. De Hilden's speculum has been replaced by cylindrical, conical, bivalve, and other forms of the instrument.
And I don't know how anything can be really learnt that is not understood. A great secret of success here is an easy and accurate use of illustration parabolic teaching. 'Every day of my life I groan over the sad loss I daily experience in not having been grounded properly in Latin and Greek.
But one must learn, and it is no disgrace for a lady to miss so small an object as a golf ball. She hit the ball on the second attempt. It did not go far, it is true, but it went gracefully, describing a parabolic curve considerably to the right of the line of the green. Then I drove a long, straight ball, and felt just a little bit ashamed of myself.
A hapless air-navigator, plunging, amid torn parachutes, sand-bags, and confused wreck, fast enough into the jaws of the Devil! Suffice it to know that Teufelsdrockh rose into the highest regions of the Empyrean, by a natural parabolic track, and returned thence in a quick perpendicular one.
Never conveying it awry, nor spilling the least drop, he compelled the frothy liquor, as it seemed to me, to spout forth from one glass and descend into the other, in a great parabolic curve, as well-defined and calculable as a planet's orbit.
To be sure, I have only once in the time computed a parabolic orbit; but it seems to me that I know no more in general. I think I am a little better thinker, that I take things less upon trust, but at the same time I trust myself much less. The world of learning is so broad, and the human soul is so limited in power!
As the Lord's people in ancient times dwelt alone, and were not reckoned among the nations, the Lord's parabolic teaching stands apart by itself, and cannot with propriety be associated with other specimens of metaphorical teaching. Logically as well as spiritually it is true, that "never man spake like this man."
Arcot swung the ship a bit to one side, running in close to the flaming star. It was not exceedingly hot, despite the high temperature and intense radiation, for the radiating surface was too small. They swung about the star in a parabolic orbit, for, at their velocity, the sun could not hold them in a planetary orbit. "Our velocity, relative to this star, is pretty high," Arcot announced.
According to the current idea, a projectile fired, for example, from a cannon, moved in a straight horizontal line until the propulsive force was exhausted, and then fell to the ground in a perpendicular line. Galileo taught that the projectile begins to fall at once on leaving the mouth of the cannon and traverses a parabolic course.
When a comet approaches the sun, the orbit in which it travels indicates that it is moving under the impulse of the sun's gravitation. It is in reality falling in a great parabolic or elliptical curve through space.
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