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For a telescope to make a telescope supposes it to select copper and zinc in due proportions, and fuse them into brass; to fashion that brass into inter-entering tubes; to collect and combine the requisite materials for the different kinds of glass needed; to melt them, grind, fashion, and polish them, adjust their densities, focal distances, etc., etc. If Dr.
That is, whenever there are two solutions of different densities, separated only by an animal membrane, an interchange will take place between them through the membrane. To illustrate: in the walls of the stomach and intestines there is a network of minute vessels filled with blood, a liquid containing many substances in solution.
He had been gloomily pushing his way through the various London densities the November fog, the nocturnal darkness, the jostling crowd.
The densities were rising nicely and all seemed well, when I did what I now see was a very foolish thing. I made my 1 a.m. wireless report to Nordreich, in which I requested orders at 3 a.m. and reported my position, together with the fact that I had been badly hunted. In twenty-five minutes they were on me again!
That its stretches of meadow, willow clumps, and tangled densities are as lovely, fresh, and enticing as can be found yes, within a thousand miles of your door. That the rocks are encrusted with the thickest of moss and lichen, gray, green, black, and brilliant emerald. That the trees are superb, the solitude and rest complete.
But that meant this strange voyage of mine would come to an end, and no such end was in sight. Be that as it may, Captain Nemo also introduced me to the different data he had obtained on the relative densities of the water in our globe's chief seas. From this news I derived some personal enlightenment having nothing to do with science. It happened the morning of January 15.
Increase of density and escape of heat are correlated phenomena, and hence in the foregoing section, treating of the respective densities of the celestial bodies in connexion with nebular condensation, much has been said and implied respecting the accompanying genesis and dissipation of heat.
If we must compare the eye to an optical instrument, we ought in imagination to take a thick layer of transparent tissue, with spaces filled with fluid, and with a nerve sensitive to light beneath, and then suppose every part of this layer to be continually changing slowly in density, so as to separate into layers of different densities and thicknesses, placed at different distances from each other, and with the surfaces of each layer slowly changing in form.
At sea, ships, rocked by the waves, are in perpetual movement. In the air, balloons incessantly oscillate upon the fluid strata of different densities. This projectile alone, travelling in absolute void amidst absolute silence, offered absolute repose to its inhabitants.
The crest of a wave falls over a portion of air, imprisoning it for a moment, and the mingled air and water of different densities prevent the light of the sun or sky from going straight down into the black depths and being lost, but by being reflected and turned back it shows like beautiful white lace, constantly created and dissolved with a thousandfold more beauty than any that ever came from human hands.
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