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The High-frequency Active Auroral Research Program (HAARP) is a University of Alaska Fairbanks program which researches the ionosphere – the highest, ionized part of Earth's atmosphere. The most prominent instrument at HAARP is the Ionospheric Research Instrument (IRI), a high-power radio frequency transmitter facility operating in the high ...
The HARPS can attain a precision of 0.97 m/s (3.5 km/h), [2] making it one of only two instruments worldwide with such accuracy. [citation needed] This is due to a design in which the target star and a reference spectrum from a thorium lamp are observed simultaneously using two identical optic fibre feeds, and to careful attention to mechanical stability: the instrument sits in a vacuum vessel ...
The "Shamrock model folk harp" has 34 strings. It stands 55 inches (140 cm) tall with its legs. The legs can be removed so the player can hold the instrument lap—style on the knees. It weighs about 10 kilograms (22 lb). It features Celtic designs on the soundboard. An Irish or folk harp player is sometimes called a harper rather than harpist.
The Sharpsichord is a musical instrument created by Henry Dagg in Faversham, Kent. [1] It is a pin-barrel harp that plays music using a system of pegs, like a music box. [2] [3] The pegs slot into a grid of 11,520 holes [1] to program songs onto a 46-string harp using a chromatic scale. [4] The harp is then amplified by a pair of large horns.
The framed style, which is often created to look like a harp with strings, uses an array of photodiodes or photoresistors inside the upper or lower part of the frame to detect blocking of the laser beams. The framed harp built by Geoffrey Rose in 1975–1976 was an octagonal shape with a 5×5 matrix of laser beams. [2]
Project HARP originated as the brainchild of Gerald Bull, a renowned but controversial ballistic engineer specializing in high-velocity guns and gun propulsion systems. [2] [3] In the mid-1950s, Bull was working on anti-ballistic missile (ABM) and intercontinental ballistic missile (ICBM) research at the Canadian Armaments and Research Development Establishment (CARDE) when he formulated the ...