From: owner-ammf-digest@smoe.org (alt.music.moxy-fruvous digest) To: ammf-digest@smoe.org Subject: alt.music.moxy-fruvous digest V14 #15297 Reply-To: ammf@fruvous.com Sender: owner-ammf-digest@smoe.org Errors-To: owner-ammf-digest@smoe.org Precedence: bulk alt.music.moxy-fruvous digest Monday, December 30 2024 Volume 14 : Number 15297 Today's Subjects: ----------------- Are you in pain? do this now. ["Monique" ] ---------------------------------------------------------------------- Date: Mon, 30 Dec 2024 13:03:52 +0100 From: "Monique" Subject: Are you in pain? do this now. Are you in pain? do this now. http://renewritual.ru.com/ruS8WbHigfBa_gOHcOMSUVBMoM0IU5zjNq4KNOcG2LEHkiQVQQ http://renewritual.ru.com/FNyP5nc9ywwYPu2pGgq7NS89ODZsRXadvqYPqcdy1G9Pu1rcpQ derwater in the same way as bats use sound for aerial navigation seems to have been prompted by the Titanic disaster of 1912. The world's first patent for an underwater echo-ranging device was filed at the British Patent Office by English meteorologist Lewis Fry Richardson a month after the sinking of Titanic, and a German physicist Alexander Behm obtained a patent for an echo sounder in 1913. The Canadian engineer Reginald Fessenden, while working for the Submarine Signal Company in Boston, Massachusetts, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U.S. Revenue Cutter Miami on the Grand Banks off Newfoundland. In that test, Fessenden demonstrated depth sounding, underwater communications (Morse code) and echo ranging (detecting an iceberg at a 2-mile (3.2 km) range). The "Fessenden oscillator", operated at about 500 Hz frequency, was unable to determine the bearing of the iceberg due to the 3-metre wavelength and the small dimension of the transducer's radiating face (less than 1?3 wavelength in diameter). The ten Montreal-built British H-class submarines launched in 1915 were equipped with Fessenden oscillators. During World War I the need to detect submarines prompted more research into the use of sound. The British made early use of underwater listening devices called hydrophones, while the French physicist Paul Langevin, working with a Russian immigrant electrical engineer Constantin Chilowsky, wo ------------------------------ End of alt.music.moxy-fruvous digest V14 #15297 ***********************************************