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It was quite late when he arrived, but he had already notified Miss Roemer by telegram as to his coming, with a request that she should be ready to see him. He found her waiting for him, pale and anxious-eyed, when he arrived. "I have been to Frankfurt am Main," he said, "and I have seen Mr. Pernburg " "Yes, yes, that is the name; now I remember," interrupted the girl eagerly.
The belief in instantaneous transmission was destroyed by the discovery of Roemer referred to in our last lecture. The Emission Theory of Light. The case of Newton still more forcibly illustrates the position, that in forming physical theories we draw for our materials upon the world of fact.
Sterling had talked him "out of his nonsense" for the time being, but he now wished himself back in his familiar room at Deerhurst lodge, with Hans and Griselda Roemer. They were humble folk and so was he. He had no business in this rich man's "shack" that was, in reality, a palace; where pleasure was the rule and work the exception. Well things might happen! He'd take care they should!
The mountains equal to Mont Blanc are Moret, Theophylus, and Catharnia; to Mount Rosa, Piccolomini, Werner, and Harpalus; to Mount Cervin, Macrobus, Eratosthenes, Albateque, and Delambre; to the Peak of Teneriffe, Bacon, Cysatus, Philolaus, and the Alps; to Mount Perdu, in the Pyrenees, Roemer and Boguslawski; to Etna, Hercules, Atlas, and Furnerius.
In that year Olav Roemer, a learned Dane, was engaged at the Observatory of Paris in observing the eclipses of Jupiter's moons. The planet, whose distance from the sun is 475,693,000 miles, has four satellites. We are now only concerned with the one nearest to the planet.
Owing to an error in the determination of the earth's distance from the sun, the velocity assigned to light by both Roemer and Bradley is too great. With a close approximation to accuracy it may be regarded as 186,000 miles a second. By Roemer's discovery, the notion entertained by Descartes, and espoused by Hooke, that light is propagated instantly through space, was overthrown.
Subsequently came the unexpected corroboration of Roemer by the English astronomer, Bradley, who noticed that the fixed stars did not really appear to be fixed, but that they describe little orbits in the heavens every year. The result perplexed him, but Bradley had a mind open to suggestion, and capable of seeing, in the smallest fact, a picture of the largest.
Roemer watched this moon, saw it move round the planet, plunge into Jupiter's shadow, behaving like a lamp suddenly extinguished: then at the other edge of the shadow he saw it reappear, like a lamp suddenly lighted. The moon thus acted the part of a signal light to the astronomer, and enabled him to tell exactly its time of revolution.
I managed to squeeze myself into the Roemer, which I knew as familiarly as a mouse does the private corn-loft, till I reached the main entrance, before which the electors and ambassadors, who had first arrived in their state-coaches, and had assembled above, were now to mount their horses. The stately, well-trained steeds were covered with richly laced housings, and ornamented in every way.
"He seems calm to-day," replied Muller, "although the confinement and the anxiety are evidently wearing on him." "And you heard his story? And you believe him innocent?" "I am inclined to do so. But there is more yet for me to investigate in this matter. It is certainly not as simple as the police here seem to believe. May I speak to your ward, Miss Roemer? She is at home now?"
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