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Many a one versed in acoustics would probably have been restrained by the practical difficulty of impressing the vibrations on a yielding material, and making them react upon the reproducing tympanum. But Edison, with that daring mastery over matter which is a characteristic of his mechanical genius, put it confidently to the test.
When, a few years later, Chladni of Wittenberg, the founder of scientific acoustics, began to admit the phenomenon and to believe in the existence of aërolites, he was stigmatized as "a man who was ignorant of every law and who did not consider the damage he was doing in the moral world"; and one savant declared that "if he had himself seen iron fall from the sky at his own feet, he would not have believed it."
I shall have something special to call your minds to on this point presently. Bear in mind also that the Egyptians knew sciences, of which today, despite all our advantages, we are profoundly ignorant. Acoustics, for instance, an exact science with the builders of the temples of Karnak, of Luxor, of the Pyramids, is today a mystery to Bell, and Kelvin, and Edison, and Marconi.
Theorists have been known to pronounce against a promising invention which has afterwards been carried to success, and it is not improbable that if Edison had been an authority in acoustics he would never have invented the phonograph. It happened in this wise.
The Christus oratorio was given at the first concert of the festival at Heidelberg. It lasted three hours and a half and is so long that I would not dare to advise concert managers to try such an adventure. The performance was sublime. It was given in a newly constructed square hall. Cavaillé-Coll, who knew acoustics, used to advise the square hall for concerts but nobody would listen to him.
There are many other important active sensor classes, three of which are active acoustics, lidar and magnetic anomaly detectors. The practical application of lidar is a relatively recent development enabled by advances in laser, power management, and data processing technologies. Lidar detects shape directly and shape fluctuations such as vibration and motion and has proven very hard to spoof.
The logograph had traced all the curves of speech with ink on paper; and it only remained to impress them on a solid surface in such a manner as to regulate the vibrations of an artificial tympanum or drum. Yet no professor of acoustics thought of this, and it was left to Edison, a telegraphic inventor, to show them what was lying at their feet.
The siege of Avaricum by Caesar The complete subjugation of Gaul The statue of the Dying Gaul at Rome Beauty of Bourges The cathedral Not completed according to design Defect in height Strict geometrical proportion in design not always satisfactory Necessity of proportion for acoustics Domestic architecture in Bourges The house of Jacques Coeur Story of his life A rainy day Why Bourges included in this book A silver thimble Que de singeries faites-vous la, Madeleine?
Copernicus has shown that what appears real, to material sense and feeling, is absolutely unreal. Astronomy, optics, acoustics, and hydraulics are all at war with the testimony of the physical senses. This fact intimates that the laws of Science are mental, not material; and Christian Science demonstrates this. The rule of divinity is golden; to be wise and true rejoices every heart.
The curious acoustics of the Taj are observable to the visitor going often to Arjamand's shrine. A harsh voice is echoed harshly back and ceases quickly; but a woman's tones raised gently in song are echoed many times, diversified and amplified in strange combinations of melody.
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