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Only we must be on our guard against ascribing a state of motion to the ether. Certainly, from the standpoint of the special theory of relativity, the ether hypothesis appears at first to be an empty hypothesis. In the equations of the electromagnetic field there occur, in addition to the densities of the electric charge, only the intensities of the field.
But taking the different densities into consideration, it was easy to reckon that this point would be situated at 47/60ths of the whole journey, i.e., at 78,514 leagues from the earth. At this point, a body having no principle of speed or displacement in itself, would remain immovable forever, being attracted equally by both orbs, and not being drawn more toward one than toward the other.
This theorem is independent of any hypothesis with respect to the law of the densities of the successive strata of the earth. Now the increase of gravity at the pole may be ascertained by means of observations with the pendulum in different latitudes. Hence it is plain that Clairaut's theorem furnishes a practical method for determining the value of the earth's ellipticity. Translator.
Now, the power of elevation lies altogether in the superior lightness of the gas in the balloon compared with the atmospheric air; and, at first sight, it does not appear probable that, as the balloon acquires altitude, and consequently arrives successively in atmospheric strata of densities rapidly diminishing I say, it does not appear at all reasonable that, in this its progress upwards, the original velocity should be accelerated.
"The air around us is of different densities, which causes the rays of reflection of our ship to be bent, sending the image up on the shore. What sailors call 'looming, often seen on our own shores, is produced in the same way; and we often see an island, or a vessel, looming up away above the water, from which it is sometimes separated by a strip of sky.
The proposition appealed to Mrs. Briscoe, and she was grateful for the suggestion, since it served, however illogically, to soothe her nerves. She looked at Bayne very kindly when he came in with his host, from the dripping densities of the fog, his face shining like marble with the pervasive moisture, his pistol in his hand, declaring that there was absolutely nothing astir. But indeed there was more than kind consideration in Mrs. Briscoe's look; there was question, speculation, an accession of interest, and he was quick to note an obvious, though indefinable, change in Mrs. Royston's eyes as they rested upon him. She had spent the greater portion of the evening tête-
The chimney is not only an apparatus designed to carry off the smoke and gases due to combustion, for its principal role is to break the equilibrium of the atmospheric air, which is the great reservoir of oxygen, and to suck into the flame, through the difference of densities, this indispensable agent to combustion.
Heavy clouds passed above us, forming and fading swiftly. But after thinking it over, I realized that these so-called clouds were caused simply by the changing densities of the long ground swells, and I even spotted the foaming "white caps" that their breaking crests were proliferating over the surface of the water.
If the exploration takes place in the delta of a great river, the light is affected by the various densities of the double refracting media. At the proper depth one can see clearly the line where these two meet, clean cut and as sharply defined as the bottom of a green glass tumbler through the pure water it contains.
But with clustered bodies already immersed in a resisting medium, and especially if such bodies are of small densities, such as those we are considering, the process of concentration will begin forthwith: two factors conspiring to produce it.
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