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Updated: May 29, 2025
Down the wall from near the top of the dome there appears to flow a beautiful waterfall showing a variety of colors in the straight lines, as if from refraction. The fall is, of course, dripstone, and I knew we had found Niagara, although we had gone beyond the reach of the guide's voice almost at the start.
Finding, as he believed, that the defects of the telescope could not be remedied by any application of the principle of refraction he was led to look in quite a different direction for the improvement of the tool on which the advancement of astronomy depended. The REFRACTION of light depended as he had found, upon the colour of the light.
It was then ten in the morning; the rays of the sun struck the surface of the waves at rather an oblique angle, and at the touch of their light, decomposed by refraction as through a prism, flowers, rocks, plants, shells, and polypi were shaded at the edges by the seven solar colours.
The regular sky-line broken by tall knolls and clumps, whose limits are rivulet-courses and bosky dells; thrown up by refraction; flecked with shreds of heavy mist That like a broken purpose waste in air; and dappled with hanging mists, white as snow, and 'sun-clouds, as the natives term the cottony nimbus is easily mistaken, in the dim light of dawn, for a line of towering cliffs.
Its distance is 3 degrees 5 minutes, while that of the Salvage is only 2 degrees 1 minute. Supposing only an ordinary refraction, the eye takes in, in calm weather, from the summit of the volcano, a surface of the globe of 5700 square leagues, equal to a fourth of the superficies of Spain.
The regions thus shining to us are obviously those on which the sun has not yet set, his appearance above the horizon being prolonged, as in our own case, by refraction, though to a much larger extent. The magnitude of the sun's disk as seen from Venus, a third larger than it appears to us, is also adducted by Mr.
Very great refraction all round. A tabular berg about fifty feet high ten miles west is a good index of the amount of refraction. On ordinary days it shows from the mast-head, clear-cut against the sky; with much refraction, the pack beyond at the back of it lifts up into view; to-day a broad expanse of miles of pack is seen above it.
Dolores ceased speaking and lay, scarcely stirred by her faint respiration, gazing over the schooner's stern at the sinking sun. The golden disk was turning to red and across its darkened face the cliff and Point stood out in sharp silhouette, which grew larger as the great glowing sun was distorted and enlarged by the refraction near the horizon.
Every time, however, that we deal with general phenomena which are independent of these special conditions, the parallelism is perfect; and with the waves, we have put in evidence the reflexion, refraction, total reflexion, double reflexion, rotatory polarization, dispersion, and the ordinary interferences produced by rays travelling in the same direction and crossing each other at a very acute angle, or the interferences analogous to those which Wiener observed with rays of the contrary direction.
He adds, "That most subtile spirit which Newton suspected to pervade natural bodies, and to lie concealed in them so as to cause attraction and repulsion, the emission, reflection, and refraction of light, electricity, calefaction, sensation, and muscular motion, is described by the Hindus as a fifth element, endued with those very powers; and the Vedas abound with allusions to a force universally attractive, which they chiefly attribute to the sun."
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