Wikipedia:Portal:Portal
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The portal of portals
A portal is an opening in the walls of a building, gate or fortification, and especially a grand entrance to an important structure. Doors, metal gates or portcullis in the opening can be used to control entry or exit. The surface surrounding the opening may be made of simple building materials or decorated with ornamentation. Elements of a portal can include the voussoir, tympanum, an ornamented mullion or trumeau between doors, and columns with carvings of saints in the westwork of a church.
Portals in science fiction, such as wormholes and gates, allow rapid travel between distant locations, often originating from some combination of natural phenomenon and technological device. These fictional devices are required for most stories on an inter-solar scale, otherwise transit time would be excessive for storytelling purposes. An advantage of portal technology over a faster-than-light drive is that it can be imagined to work instantly, and can travel to the past or future. In other forms of fiction, a portal may be magical, and connect to an alternate universe or plane of existence.
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Portal axles (or portal gear) are an offroad technology where the axle tube is above the center of the wheel hub. Compared to normal layout, this enables the vehicle to gain a higher ground clearance, as both the axle tube and differential casing are tucked up higher under the vehicle.
Due to the gear reduction at the wheel which lessens the torque on all the other drivetrain components, the size of the differential casing can be reduced to gain even more ground clearance. Additionally, all drivetrain elements, in particular the transfer gearbox and driveshafts can be built lighter. This can be of use in reducing the centre of gravity for a given ground clearance.
As it requires a heavier and more complex hub assembly, however, these systems can result in an increased unsprung weight and require robust axle control elements to give predictable handling. In addition, at higher speeds the hub assembly can overheat.
Selected biography
Charles Frederick Algernon Portal, 1st Viscount Portal of Hungerford KG GCB OM DSO & Bar MC (21 May 1893 - 22 April 1971) was a senior Royal Air Force officer and an advocate of strategic bombing. He was the British Chief of the Air Staff during most of the Second World War.
Born in Hungerford, Portal was educated at Winchester College and Christ Church, Oxford, but left undergraduate life prematurely to enlist as a private soldier in 1914. Joining the British Army as a dispatch rider in the motorcycle section of the Royal Engineers on the Western Front, he was given command of all riders in the 1st Corps Headquarters Signals Company in December 1914.
In 1915 Portal transferred to the Royal Flying Corps, serving first as an observer and eventually a flying officer. He reached the rank of lieutenant colonel and earned the Military Cross. After the war, he took over No. 7 Squadron RAF and concentrated on improving bombing accuracy. By 1939 Portal was Director of Organization in the Air Ministry.
At the outbreak of World War II, Portal was made Acting Air Marshal and later commander-in-chief of RAF Bomber Command. Winston Churchill was impressed with Portal's strategy of area bombing (which resulted in the Luftwaffe bombing London instead of British airfields) and knighted Portal in July 1940. He was appointed Air Chief Marshal in October 1940, and Marshal of the Royal Air Force in June 1944.
After the war, Portal retired from the RAF and was created Baron Portal of Hungerford (later Viscount Portal). After a 5-year period at the Ministry of Supply, he was elected Chairman of British Aluminium and fought a hostile takeover bid by Sir Ivan Stedeford, Chairman & CEO of Tube Investments. Losing to Stedeford, he was elected chairman of the British Aircraft Corporation in 1960, and died in 1971, aged 77.
In the news
- Door opens mid-Qantas flight; plane makes an emergency landing
- Belgian Indymedians discuss participatory journalism at open door day
- Alaskan plane crash survivors say cargo door swung open
- World Health Organization launches clinical trial website
- Kids game portal BBC Jam to close after competition complaints
- With pressure from France, Chad and Sudan open door to possible troop deployment
- Switzerland shut door on Korean Republic 2-0 in Group G
- Sydney train doors stuck, passengers delayed
- Entrepreneur's RFID chip implant to open doors, start car
Categories
- Doors — panels or barriers used to cover an opening
- Gates — entry points to an enclosed space
- Portals — focus pages which highlight a particular subject
- Portals on Wikimedia Commons - images of portals
Did you know?
- Portal hypertension is often the result of cirrhosis of the liver
- The Dark Portal is the first book in the Deptford Mice trilogy
- Fort Portal in Uganda is the seat of both Kabarole and the Toro Kingdom
- Portal's Weighted Companion Cube has fan-created plush and papercraft versions
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Selected geography
Portal is a city in Burke County, North Dakota in the United States. The population was 131 at the 2000 census. Portal was founded in 1893.
Portal sits near the Canadian border and is a major port of entry for road and rail traffic. It is one of three 24-hour ports in North Dakota (the others being Dunseith and Pembina). The town is known for its "international" golf course. The ninth hole is partially in the United States and partially in Canada.
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That heavenly music! what is it I hear?
The notes of the harpers ring sweet in mine ear.
And, see, soft unfolding those portals of gold,
The King all arrayed in his beauty behold!
- — William Augustus Muhlenberg, I would not live alway
Related portals
