H. J. Round

Captain H. J. RoundHenry RoundRound, H. J.
Captain Henry Joseph Round (2 June 1881 – 17 August 1966) was an English engineer and one of the early pioneers of radio.wikipedia
46 Related Articles

Light-emitting diode

LEDLEDslight emitting diodes
He was the first to report observation of electroluminescence from a solid state diode, leading to the discovery of the light-emitting diode.
Electroluminescence as a phenomenon was discovered in 1907 by the British experimenter H. J. Round of Marconi Labs, using a crystal of silicon carbide and a cat's-whisker detector.

Pate's Grammar School

Cheltenham Grammar SchoolCheltenham Grammar School for BoysPate's Grammar School for Girls
He spent his early years in the small town of Kingswinford in Staffordshire and received his early education at Cheltenham Grammar School.
H. J. Round, scientist, played an important part in the discovery of light-emitting diodes

Crystal detector

cat's whiskercat's whisker detectorcat's-whisker detector
In some later experiments with cat's whisker detectors using a variety of substances, he passed current through them and noticed that some gave off light – the first known report of the effect of the light-emitting diode.
In 1907 British Marconi engineer Henry Joseph Round noticed that when direct current was passed through a silicon carbide (carborundum) point contact junction, a spot of greenish, bluish, or yellowish light was given off at the contact point.

Electroluminescence

electroluminescentELelectroluminescent panel
He was the first to report observation of electroluminescence from a solid state diode, leading to the discovery of the light-emitting diode.

Guglielmo Marconi

MarconiMarconi's Wireless Telegraph CompanyThe Marchese Marconi
He was a personal assistant to Guglielmo Marconi.

Kingswinford

Dudley Road, Kingswinford
He spent his early years in the small town of Kingswinford in Staffordshire and received his early education at Cheltenham Grammar School.

Staffordshire

StaffordStaffordshire, EnglandCounty of Stafford
He spent his early years in the small town of Kingswinford in Staffordshire and received his early education at Cheltenham Grammar School.

Royal College of Science

Normal School of ScienceImperial College LondonRoyal College of Science building
He later attended the Royal College of Science, a constituent college of Imperial College London where he gained a first class honours degree.

Imperial College London

Imperial CollegeImperial College of Science and TechnologyImperial College, London
He later attended the Royal College of Science, a constituent college of Imperial College London where he gained a first class honours degree.

Marconi Company

MarconiMarconi Wireless Telegraph CompanyMarconi's Wireless Telegraph Company
Round joined the Marconi Company in 1902; not long after Marconi had made his transatlantic wireless transmission.

Inductor

inductorscoilinductive
He was sent to the USA where he experimented with a variety of different aspects of radio technology, focusing on technologies such as powdered iron cored tuning inductors.

Triode

triode amplifiertriode tubevacuum triode
He headed Marconi's research program into thermionic tubes, and developed a three-element (triode) amplifying tube at roughly the same time as Lee De Forest was developing the Audion in the US.

Lee de Forest

DeForestLee DeForestDe Forest
He headed Marconi's research program into thermionic tubes, and developed a three-element (triode) amplifying tube at roughly the same time as Lee De Forest was developing the Audion in the US.

Audion

audion tubeAudion amplifier tubeAudion vacuum tube
He headed Marconi's research program into thermionic tubes, and developed a three-element (triode) amplifying tube at roughly the same time as Lee De Forest was developing the Audion in the US.

Feedback

feedback loopfeedback loopsfeedback mechanism
He discovered feedback (regeneration) in vacuum tubes independently along with Alexander Meissner and Edwin Armstrong, and built some of the first AM vacuum tube radio transmitters.

Alexander Meissner

He discovered feedback (regeneration) in vacuum tubes independently along with Alexander Meissner and Edwin Armstrong, and built some of the first AM vacuum tube radio transmitters.

Edwin Howard Armstrong

Edwin ArmstrongArmstrongEdwin H. Armstrong
He discovered feedback (regeneration) in vacuum tubes independently along with Alexander Meissner and Edwin Armstrong, and built some of the first AM vacuum tube radio transmitters.

World War I

First World WarGreat WarFirst
The First World War broke out in 1914, and Round was commissioned onto the General List and seconded to Military Intelligence with the rank of captain.

Western Front (World War I)

Western FrontFranceWestern
Using his experience in direction finding, he set up a chain of direction finding stations along the Western Front.

Admiralty

Lord High AdmiralBritish Admiraltythe Admiralty
Consequently, the British Admiralty ordered the British fleet to set sail and engage the German fleet.

Battle of Jutland

JutlandJutland 1916battle
The Battle of Jutland, the largest sea battle of all time, occurred the next day.

Military Cross

MCM.C.MC & Bar
For his service during the war, Round was awarded the Military Cross.

World War II

Second World WarwarWWII
When the Second World War broke out in 1939, the British Government again called on his services.

Sonar

asdicvariable depth sonaractive sonar
This time he was involved in ASDIC (Anti-Submarine Detection Investigation Committee) which is known today as sonar.

Bognor Regis

BognorBognor Regis, West SussexRAF Bognor
Round died in August 1966 in a nursing home in Bognor Regis after a short illness.