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Harold Beverage
Harold Beverage (1893–1993) was an American radio engineer who invented the wave antenna, patented in 1921, and became vice president of research and development at RCA.
Harold Bride
Harold Sydney Bride was an English Marconi wireless operator, the junior operator aboard the Titanic and the only one of the ship's two wireless operators to survive its 1912 sinking.
Harold Cottam
Harold Thomas Cottam was a British Marconi wireless operator who, as the Carpathia's sole radio operator, received the Titanic's distress call on 14 April 1912.
Harold Edgerton
Harold Edgerton, known as "Doc" Edgerton, was an American electrical engineer at MIT who invented the repeatable electronic stroboscopic flash and made high-speed photographs of events too fast for the eye.
Harold Etherington
Harold Etherington (1900–1994) was an American nuclear engineer who helped develop the first nuclear submarine power plants and early boiling-water reactors, and edited the 1958 Nuclear Engineering Handbook.
Harold F. Dodge
Harold F. Dodge (1893–1976) was an American statistician and quality-control engineer at Bell Laboratories who originated acceptance sampling and co-developed the Dodge-Romig Sampling Inspection Tables.
Harold G. Sowman
Harold G. Sowman was an American ceramic engineer at 3M who pioneered sol-gel ceramic fibers and abrasives, elected to the National Academy of Engineering in 1984.
Harold Liebowitz
Harold Liebowitz (1924–2004) was an American aerospace engineer and fracture mechanics specialist who led George Washington University's engineering school and edited the seven-volume Fracture: An Advanced Treatise.
Harold Lowe
Harold Godfrey Lowe (1882–1944) was a Welsh merchant navy officer who served as Fifth Officer of RMS Titanic and commanded Lifeboat 14, the only officer to return for survivors.
Harold Mirels
Harold Mirels (1924–2023) was an American aerospace researcher at NACA and The Aerospace Corporation known for shock-tube boundary-layer theory and the Mirels test-time correlation, and elected to the National Academy of Engineering in 1986.
Harold N. Scherer Jr.
Harold N. Scherer Jr. (1929–2017) was an American electric power engineer who led the design and energization of the first 765-kV transmission line, then the world's highest voltage.
Harold Rosen (electrical engineer)
Harold Rosen (1926–2017) was an American electrical engineer at Hughes Aircraft who conceived and led Syncom, the first geosynchronous communications satellite, earning the Draper Prize.
Harold S. Mickley
Harold S. Mickley, also known as Harold Somers Mickley, was an American chemical engineer who taught at MIT and became vice chairman of Stauffer Chemical Company.
Harold Thimbleby
Harold Thimbleby, born 1955, is a British computer scientist and Emeritus Professor at Swansea University, known for founding the UCL Interaction Centre and for showing that poorly designed medical devices cause unnoticed errors that harm patients.
Harold W. Paxton
Harold W. Paxton, also known as Harold William Paxton, was a British-born American physical metallurgist and Carnegie Mellon professor elected to the National Academy of Engineering in 1978.
Harpoon (missile)
Harpoon (RGM-84/UGM-84/AGM-84), US subsonic sea-skimming anti-ship cruise missile by McDonnell Douglas/Boeing, in service since 1977; active radar seeker, 224 kg warhead, 92.6–248 km range by variant, exported to 32 countries.
Harquahala generating project
The Harquahala Generating Project is a 1,092 MW natural gas-fired combined-cycle power plant in the Harquahala Valley of Arizona, in service since 2004 and owned by Capital Power and BlackRock.
Harrier jump jet
The Harrier jump jet is a family of British and American military aircraft capable of vertical takeoff and landing, powered by a vectored-thrust Rolls-Royce Pegasus engine.
Harrington Power Plant
Harrington Power Plant, also called Harrington Station, is a 1,018-megawatt power plant near Amarillo, Texas, owned by Xcel Energy. Built as a coal plant in 1976, it was converted to natural gas in 2025.
Harrington Station
Harrington Station, also called Harrington Generating Station, is a power plant near Amarillo, Texas, owned by Xcel Energy. Opened in 1976, it burned coal until converting to natural gas in 2025.
Harris Corporation
Harris Corporation was an American technology company headquartered in Melbourne, Florida, providing communications and electronic systems to defense customers until its 2019 merger with L3 Technologies.
Harris County Flood Control District
The Harris County Flood Control District is a special purpose district created by the Texas Legislature in 1937 to reduce flood damage in Harris County, the county containing Houston.
Harris J. Ryan
Harris J. Ryan (1866–1934) was an American electrical engineer who studied high-voltage power transmission at Cornell and from 1905 at Stanford, receiving the Edison Medal in 1925.
Harris Wang
Harris Wang is an American synthetic biologist at Columbia University who works on genome engineering and microbial communities, and received the Presidential Early Career Award in 2017.
Harrisburg Covered Bridge
The Harrisburg Covered Bridge, also called East Fork Bridge, is a historic 1875 covered timber truss bridge over the East Fork of the Little Pigeon River near Sevierville, Tennessee.
Harrison power station
Harrison Power Station is a coal-fired power plant in Haywood, West Virginia, along the West Fork River, owned by Mon Power, with three units totaling 1,984 megawatts.
Harro Höfliger
Harro Höfliger Verpackungsmaschinen GmbH is a German family-owned machinery manufacturer founded in 1975, headquartered in Allmersbach im Tal, that builds production and packaging systems for the pharmaceutical and medical technology industries.
Harrow (tool)
A harrow is a farm implement that levels soil, breaks clods, and covers seed as secondary tillage after plowing, with spike, spring, chain, and disc types.
Harrow and Wealdstone rail crash
The Harrow and Wealdstone rail crash, also called the Harrow rail crash, was a 1952 three-train collision in London that killed 112 people, Britain's worst peacetime rail crash.
Harry Bolton Seed
Harry Bolton Seed (1922–1989) was an English-born American civil engineer at UC Berkeley, known as the father of geotechnical earthquake engineering for his work on soil behavior in earthquakes.