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Picture of the Month (September 2009)
Dedicated User Captions:
1. The invisible sound monsters will get you, too! (by Roommate)
2. Malen nach Zahlen, Folge 27: Das psychedelische Mantra (by hvb)
3. This sound is - this sound is - this sound is psychedelic (by Technotronic)

Read more captions (not voted, latest on top)

Distribution of sound intensity (1923)
Wallace Clement Sabine, an American physicist and founder of the field of architectural acoustics, researched the acoustic qualities of public buildings. This included experiments on the transmission of sounds through rooms and walls or the absorption characteristics of certain media. The graphical representation above shows the phenomenon of sound interference in a small room, where the (hypothetical) source of sound is placed in the centre (No.10) and the sound waves are reflected by the walls, resulting in areas of high (many circles) and low intensity of sound.

Related Items:
About 100 years earlier than Sabine, Chladni was well aware of the difficulties of architectural acoustics: Die Akustik by Ernst Florens Friedrich Chladni

For a list of the instruments Sabine used in his experiments, have a look at some examples.

Picture Source:
Sabine, Wallace Clement. 1923. Collected Papers On Acoustics. Cambridge: Harvard University Press

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