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Updated: June 8, 2025
A considerable time was occupied in inquiry and negotiation, when at length, on the 26th October, 1836, the light at the Isle of May was changed from the catoptric to the dioptric system, and a committee of the Royal Society of Edinburgh met at Dunbar, a distance of thirteen miles from the lighthouse, to make observations on the two lights, which were exhibited in contrast.
Within the highest division of the animal kingdom, namely, the Vertebrata, we can start from an eye so simple, that it consists, as in the lancelet, of a little sack of transparent skin, furnished with a nerve and lined with pigment, but destitute of any other apparatus. In fishes and reptiles, as Owen has remarked, "The range of gradation of dioptric structures is very great."
A red ensign was seized jack downward in her main rigging, the highest note of the sailorman's agony of distress. On its wooden case, in her starboard fore-rigging, a dioptric lens sent out the faint green glow of a lamp's light into the sunshine. The third mate drew attention to this last "Lot of oil in that lamp," he said, "or it means they haven't deserted her very long.
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