From: owner-ammf-digest@smoe.org (alt.music.moxy-fruvous digest) To: ammf-digest@smoe.org Subject: alt.music.moxy-fruvous digest V14 #15299 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 15299 Today's Subjects: ----------------- The easiest way to enjoy hot meals on the go ["Eat On the Go" Subject: The easiest way to enjoy hot meals on the go The easiest way to enjoy hot meals on the go http://maxboost.sa.com/DkMsXKqRkwQBZiQzrno_FWrTn7SC5P4yajS39NjJ-ZYS7QYHUw http://maxboost.sa.com/_MMIulXEYLetPUFJWyVwAf8H2XvACSczjQ1NA9hJizlMsuUzVQ rchant supply shipping early in World War II led to large scale high priority US research in the field, pursuing both improvements in magnetostrictive transducer parameters and Rochelle salt reliability. Ammonium dihydrogen phosphate (ADP), a superior alternative, was found as a replacement for Rochelle salt; the first application was a replacement of the 24 kHz Rochelle-salt transducers. Within nine months, Rochelle salt was obsolete. The ADP manufacturing facility grew from few dozen personnel in early 1940 to several thousands in 1942. One of the earliest application of ADP crystals were hydrophones for acoustic mines; the crystals were specified for low-frequency cutoff at 5 Hz, withstanding mechanical shock for deployment from aircraft from 3,000 m (10,000 ft), and ability to survive neighbouring mine explosions. One of key features of ADP reliability is its zero aging characteristics; the crystal keeps its parameters even over prolonged storage. Another application was for acoustic homing torpedoes. Two pairs of directional hydrophones were mounted on the torpedo nose, in the horizontal and vertical plane; the difference signals from the pairs were used to steer the torpedo left-right and up-down. A countermeasure was developed: the targeted submarine discharged an effervescent chemical, and the torpedo went after the noisier fizzy decoy. The counter-countermeasure was a torpedo with active sonar b a transducer was added to the torpedo nose, and the mic ------------------------------ End of alt.music.moxy-fruvous digest V14 #15299 ***********************************************