However, the chimes issuing directly from the Big Ben were delayed due to the distance travelled, so the "thirteenth" chime was a repeat of the twelfth that Macey heard just before over the radio.
The group temporarily disbanded but after a short break, the remaining members reformed as Bell X1, named after the Bell X-1 (note the hyphen), the first plane to break the sound barrier.
The second is his "Whisper" family of cartridges, intended to cause maximum damage at subsonic speeds, making them nearly silent when used with a firearm silencer.
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On 20 November 1953, shortly before the 50th anniversary of powered flight, Scott Crossfield piloted the Skyrocket to Mach 2, or more than 1,290 mph (2076 km/h), the first time an aircraft had exceeded twice the speed of sound.
A radio acoustic sounding system (RASS) is a system for measuring the atmospheric lapse rate using backscattering of radio waves from an acoustic wave front to measure the speed of sound at various heights above the ground.
In 2013 the UK National Physical Laboratory used microwave and acoustic resonance measurements to determine the speed of sound of a monatomic gas in a triaxial ellipsoid chamber to determine a more accurate value for the constant as a part of the revision of the International System of Units.
Thanks to its position, the keep was notably connected with the scientific experiments of Pierre Gassendi (measurement of the speed of sound), Claude Chappe (experiments with optical telegraphy in 1794) and Alfred Cornu (measurement of the speed of light in 1874).
Theodore von Kármán intervened and recommended to Eddie Allen that the Boeing wind tunnel should be designed for airspeeds near the speed of sound.
The effective volume increase can be as much as 40% and is due primarily to a reduction in the speed of sound, and not to the popular misconception of a change in operating conditions from adiabatic to isothermal.
Project Mogul was conceived by Dr. Maurice Ewing who had earlier researched the deep sound channel in the oceans and theorized that a similar sound channel existed in the upper atmosphere: a certain height where the air pressure and temperature result in minimal speed of sound, so that sound waves would propagate and stay in that channel due to refraction.
SOFAR channel (SOund Fixing And Ranging channel), a horizontal layer of water in the ocean centered around the depth at which the speed of sound is minimum
Subsonic aircraft, a flying machine that flies at air speeds lower than the speed of sound
This was followed in July with "Let 'Em In", which also scaled the singles charts. Amid all this, Wings finally went to North America for the Wings Over America Tour, playing McCartney's first shows there for ten years (after The Beatles' last tour in 1966) to euphoric reaction; a few selections from Speed of Sound were included.
In 1993, Wings at the Speed of Sound was remastered and reissued on compact disc as part of "The Paul McCartney Collection" series, along with The Country Hams' "Walking in the Park with Eloise" and its B-side "Bridge on the River Suite", and "Junior's Farm"'s B-Side "Sally G" - all recorded in Nashville in 1974 - as bonus tracks.