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"My helmsman is stationed behind the windows of a pilothouse, which protrudes from the topside of the Nautilus's hull and is fitted with biconvex glass." "Is glass capable of resisting such pressures?" "Perfectly capable. Though fragile on impact, crystal can still offer considerable resistance.
Fore and aft stood two cupolas of moderate height, their sides slanting and partly inset with heavy biconvex glass, one reserved for the helmsman steering the Nautilus, the other for the brilliance of the powerful electric beacon lighting his way. The sea was magnificent, the skies clear. This long aquatic vehicle could barely feel the broad undulations of the ocean.
Set in the cabin's walls were four deadlights, windows of biconvex glass that enabled the man at the helm to see in every direction. The cabin was dark; but my eyes soon grew accustomed to its darkness and I saw the pilot, a muscular man whose hands rested on the pegs of the wheel. Outside, the sea was brightly lit by the beacon shining behind the cabin at the other end of the platform.
The media of the eye are the crystalline lens, vitreous and aqueous humors. The crystalline lens is a transparent, biconvex body sustained by the ciliary processes. The vitreous humor is a transparent jelly-like substance that fills all the cavity of the eye posterior to the lens. The aqueous humor is a liquid, contained in the anterior and posterior chambers of the eye in front of the lens.
Here and there, opaline hues of infinite subtlety raced among sparks of light that were like so many fiery diamonds, their brilliance more than any eye could stand. The power of our beacon was increased a hundredfold, like a lamp shining through the biconvex lenses of a world-class lighthouse. "How beautiful!" Conseil exclaimed. "Yes," I said, "it's a wonderful sight! Isn't it, Ned?"
I then examined the fittings of this mechanism, whose power was increased a hundredfold by biconvex lenses that were designed like those in a lighthouse and kept its rays productively focused. This electric lamp was so constructed as to yield its maximum illuminating power. In essence, its light was generated in a vacuum, insuring both its steadiness and intensity.
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