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. . . the Reading duo performed drumming inside the chambered Neolithic mound of Camster Round, Caithness. Although the drumming could not be heard more than a hundred yards away in the open air outside the cairn, the sound faintly but seemingly magically reappeared inside the neighbouring chambered mound of Camster Long at least twice as far away.
originally posted by: Skid Mark
a reply to: Kester
There's a parabolic reflector aimed at another one far across the room. If you whisper into one anyone standing at the other will hear it but nobody else will.
Two remarkable acoustical features were noticed during excavation in the 1920s, but never explained or interpreted. A whispering gallery permits voice communication between temples located about 460 feet (140 m) apart. A profound flutter echo is heard between the two massive parallel walls of the playing field, about 270 ft (82 m) long, 28 ft (8.5 m) high, and 119 ft (36 m) apart. Until recently, most archaeologists dismissed acoustical features at Mayan sites as unintended artifacts. That is now changing.