Encyclopedia - Tunnel: Encyclopedia - Tunnel
A tunnel is an underground passage. When designed for use by traffic, it may be called an underpass. The definition of what constitutes a...   » Read the article

Encyclopedia - Tunnel: Encyclopedia Ii - Tunnel - Very Short Tunnels
A short tunnel can be a convenient way to build an overbridge. Very short tunnels resemble overbridge. For example, the Croom Tunnel on t...   » Read the article

Encyclopedia - Tunnel: Encyclopedia Ii - Tunnel - Types Of Tunnels
Tunnels are dug in various types of materials, from soft clays to hard rocks, and the method of excavation depends on the type of soil. W...   » Read the article

Encyclopedia - Tunnel: Encyclopedia Ii - Tunnel - Examples Of Tunnels
Tunnel - In history. Eupalinos Tunnel on the island Samos (Greece). Built 520 BC by the greek engineer Eupalinos. Eupalinos organised ...   » Read the article

Encyclopedia - World's Longest Tunnels: Encyclopedia - World's Longest Tunnels
World's longest tunnels - Railroad excluding subways. World's longest tunnels - Vehicular. Tunnel, List of tunnels World's longest t...   » Read the article

Encyclopedia - Williamson's Tunnels: Encyclopedia - Williamson's Tunnels
The Williamson Tunnels in Edge Hill, (Liverpool) are a collection of apparently pointless tunnels built by local men employed by Joseph W...   » Read the article

Encyclopedia - Box Tunnel: Encyclopedia - Box Tunnel
Box Tunnel is a railway tunnel in western England, between Bath and Chippenham, dug through the Box Hill. It was built for the original r...   » Read the article

Encyclopedia - Channel Tunnel: Encyclopedia - Channel Tunnel
The Channel Tunnel, (French: le tunnel sous la Manche; popularly nicknamed the Chunnel in English, although this has been largely abandon...   » Read the article

Encyclopedia - Chicago Tunnel Company: Encyclopedia - Chicago Tunnel Company
The Chicago Tunnel Company built a unique freight tunnel network under the downtown of the city of Chicago. It inspired the construction ...   » Read the article

Encyclopedia - Carpal Tunnel: Encyclopedia - Carpal Tunnel
In the wrist there is a sheath of tough connective tissue which envelopes and protects one nerve (median nerve) and tendons, which attach...   » Read the article

Encyclopedia - Wind Tunnel: Encyclopedia - Wind Tunnel
A wind tunnel is a research tool developed to assist with studying the effects of air moving over or around solid objects. Air is blown o...   » Read the article

Encyclopedia - Carpal Tunnel Syndrome: Encyclopedia - Carpal Tunnel Syndrome
Carpal tunnel syndrome is a medical condition in which the median nerve is compressed at the wrist causing symptoms like tingling, pain, ...   » Read the article

Encyclopedia - Cobble Hill Tunnel: Encyclopedia - Cobble Hill Tunnel
The Atlantic Avenue Tunnel (or Cobble Hill Tunnel of the Long Island Rail Road) is an abandoned railroad tunnel beneath Atlantic Avenue i...   » Read the article

Encyclopedia - Bridges And Tunnels In New York City: Encyclopedia - Bridges And Tunnels In New York City
Bridges and tunnels in New York City - East River. From north to south: Throgs Neck Bridge Bronx-Whitestone Bridge Rikers Island Bridg...   » Read the article

Encyclopedia - Williamson's Tunnels: Encyclopedia Ii - Williamson's Tunnels - The Tunnels
The tunnels are in an area to the east of the Liverpool Metropolitan Cathedral in a rectangle bordered by Mason Street, Grinfield Street,...   » Read the article

Encyclopedia - Smuggling Tunnels: Encyclopedia Ii - Smuggling Tunnels - The American Smuggling Tunnels
Shanghai tunnels have been used to smuggle people out of the United States to work as slaves aboard ships. The long land borders of the U...   » Read the article

Encyclopedia - Tunnel Boring Machine: Encyclopedia Ii - Tunnel Boring Machine - Urban Tunneling And Near Surface Tunneling
Urban tunneling has the special challenge of requiring that the ground surface be undisturbed. This means that ground subsidence must be ...   » Read the article

Encyclopedia - World's Longest Tunnels: Encyclopedia Ii - World's Longest Tunnels - The World's Longest Tunnels
World's longest tunnels - Railroad excluding subways. World's longest tunnels - Vehicular. ... See also:World's longest tunnels, Wo...   » Read the article

Encyclopedia - Channel Tunnel: Encyclopedia Ii - Channel Tunnel - The Current Tunnel
Channel Tunnel - Planning. In 1957 le Tunnel sous la Manche Study Group was formed. It reported in 1960 and recommended two main railwa...   » Read the article

Encyclopedia - Tunnel Boring Machine: Encyclopedia Ii - Tunnel Boring Machine - Description
A tunnel boring machine (TBM) typically consists of one or two shields (large metal cylinders) and trailing support mechanisms. At the fr...   » Read the article

Encyclopedia - Tunnelling Shield: Encyclopedia Ii - Tunnelling Shield - History
The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel beginning in 1825 (though ...   » Read the article

Encyclopedia - Clyde Tunnel: Encyclopedia Ii - Clyde Tunnel - Construction
A single tunnelling shield, based on Marc Isambard Brunel's design used for the Thames Tunnel a century earlier, was used to dig the tunn...   » Read the article

Encyclopedia - Blackwall Tunnel: Encyclopedia Ii - Blackwall Tunnel - History
The western tunnel was built at the end of the 19th century, while the other was added some 70 years later. The older western tunnel, des...   » Read the article

Encyclopedia - Holland Tunnel: Encyclopedia Ii - Holland Tunnel - History
The concept for what would become the Holland Tunnel was developed in 1906 by a joint commission between New York and New Jersey. The com...   » Read the article

Encyclopedia - Queensway Tunnel: Encyclopedia Ii - Queensway Tunnel - History
In the 1920s there were concerns about the long queues of cars and lorries at the Mersey Ferry terminal and in 1925, the construction of ...   » Read the article

Encyclopedia - Cascade Tunnel: Encyclopedia Ii - Cascade Tunnel - History
The first tunnel had a fume problem because it was built too steep and too close to the ruling grade. The tunnel was electrified by 1909,...   » Read the article

Encyclopedia - Smuggling Tunnels: Encyclopedia Ii - Smuggling Tunnels - Smuggling Tunnels In Rafah Gaza Strip
Smuggling tunnels connect Egypt and the Gaza Strip, bypassing the international border established by the Israel-Egypt Peace Treaty. The ...   » Read the article

Encyclopedia - Smuggling Tunnels: Encyclopedia Ii - Smuggling Tunnels - Smuggling Tunnel In Sarajevo Bosnia
During the Siege of Sarajevo a tunnel underneath the no-man's land of the city's (closed) airport provided a vital smuggling link for the...   » Read the article

Encyclopedia - Blackwall Tunnel: Encyclopedia Ii - Blackwall Tunnel - Overview
The southern entrances are just west of the Millennium Dome on the Greenwich Peninsula; the northern portal lies just south of the A13 in...   » Read the article

Encyclopedia - Columbia University Tunnels: Encyclopedia Ii - Columbia University Tunnels - Tunnel Layout
Columbia University has an extensive tunnel system. All buildings on campus are connected to a tunnel system. The oldest tunnels are from...   » Read the article

Encyclopedia - Quantum Tunnelling: Encyclopedia Ii - Quantum Tunnelling - History
In the early 1900s radioactive materials were known to have characteristic exponential decay rates or half lives. At the same time, radia...   » Read the article

Encyclopedia - Wind Tunnel: Encyclopedia Ii - Wind Tunnel - History
English military engineer Benjamin Robins (1707–1751) invented a whirling arm apparatus to determine drag. The Englishmen Wenham and Br...   » Read the article

Encyclopedia - Tunnelling Shield: Encyclopedia Ii - Tunnelling Shield - Modern Tunnel Boring Machines
See main article: tunnel boring machine A tunnel boring machine (TBM), consists of a shield (a large metal cylinder) and trailing support...   » Read the article

Encyclopedia - Tyne Tunnel: Encyclopedia Ii - Tyne Tunnel - Proposed New Tyne Tunnel
Current utilisation of the tunnel is 34,000 vehicles per day and forecast to rise to 43,000 per day by 2021. As at March 2004, the Tyne &...   » Read the article

Encyclopedia - Tyne Tunnel: Encyclopedia Ii - Tyne Tunnel - Tyne Cyclist And Pedestrian Tunnel
Tyne Cyclist and Pedestrian Tunnel runs under the River Tyne between Howdon and Jarrow, and was opened in 1951. It actually consists of t...   » Read the article

Encyclopedia - Tunnel Boring Machine: Encyclopedia Ii - Tunnel Boring Machine - Shields
Modern TBMs typically have an integrated shield. The choice of a single or double shielded TBM depends on the type of geology and the exc...   » Read the article

Encyclopedia - Channel Tunnel: Encyclopedia Ii - Channel Tunnel - Historical Attempts Or Proposals For A Tunnel
A link between Great Britain and continental Europe had been proposed on many occasions. 1802 Albert Matthieu-Favier, a French engineer,...   » Read the article

Encyclopedia - St. Gotthard Tunnel: Encyclopedia Ii - St. Gotthard Tunnel - Rail Tunnels
The St. Gotthard railway tunnel, close but separate from the expressway tunnel, handles rail traffic on the north-south line in Switzerla...   » Read the article

Encyclopedia - Cascade Tunnel: Encyclopedia Ii - Cascade Tunnel - Accidents
On March 1, 1910 an avalanche at Wellington, the West portal of the original 2.6 mile-long Cascade Tunnel, killed 101 people, the deadlie...   » Read the article

Encyclopedia - The Time Tunnel: Encyclopedia Ii - The Time Tunnel - The Series
The premise of the program is based on a top secret classified U.S. government experimental time machine that cost as much as the entire ...   » Read the article

Encyclopedia - Williamson's Tunnels: Encyclopedia Ii - Williamson's Tunnels - The Tourist Attraction
Up until the 1990s, nearly every tunnel was completely full to the top with rubbish. The tunnels have become a popular tourist attraction...   » Read the article

Encyclopedia - List Of Rathole Tunnels: Encyclopedia Ii - List Of Rathole Tunnels - Avoiding A Rathole Tunnel
The first Cascade Tunnel, built from 1897 to 1900, had problems with smoke because it was long and steeply graded. The key dimensions are...   » Read the article

Encyclopedia - St. Gotthard Tunnel: Encyclopedia Ii - St. Gotthard Tunnel - History
The widely used expressway tunnel was opened on September 5, 1980, in response to the automobile boom in Switzerland and the popularity o...   » Read the article

Encyclopedia - Williamson's Tunnels: Encyclopedia Ii - Williamson's Tunnels - Joseph Williamson
Joseph Williamson was a 19th-century philanthropist, tobacco merchant, property owner and pioneer of tunnels. He was born on 10 March 176...   » Read the article

Encyclopedia - Box Tunnel: Encyclopedia Ii - Box Tunnel - Brunel's Birthday
There is a story which states that Brunel deliberately aligned the tunnel such that the rising sun is visible through it on April 9 each ...   » Read the article

Encyclopedia - Carpal Tunnel: Encyclopedia Ii - Carpal Tunnel - Medical/anatomical Definition
The carpal tunnel is a fibro-osseous tunnel on the palmar surface of the carpal bones which transmits a number of tendons and the median ...   » Read the article

Encyclopedia - Roof And Tunnel Hacking: Encyclopedia Ii - Roof And Tunnel Hacking - Tunnel Hacking
Many large universities have a system of utility tunnels designed to carry steam (central steam heating being more efficient than install...   » Read the article

Encyclopedia - Chicago Tunnel Company: Encyclopedia Ii - Chicago Tunnel Company - History
Construction of the subway began in 1899, and the full system with a tunnel under almost every street of downtown Chicago was finished in...   » Read the article

Encyclopedia - Roof And Tunnel Hacking: Encyclopedia Ii - Roof And Tunnel Hacking - Dangers
Roof and tunnel hacking is laden with dangers to participants. Roofers and tunnelers risk university sanctions, criminal prosecution, ser...   » Read the article

Encyclopedia - Quantum Tunneling: Encyclopedia Ii - Quantum Tunneling - Tunneling Trivia
One of the major applications is in electron-tunneling microscopes (see scanning tunneling microscope) used to see objects that are too s...   » Read the article

Encyclopedia - Quantum Tunnelling: Encyclopedia Ii - Quantum Tunnelling - Tunnelling Trivia
One of the major applications is in electron-tunnelling microscopes (see scanning tunnelling microscope) used to see objects that are too...   » Read the article

Encyclopedia - Emlen Tunnell: Encyclopedia Ii - Emlen Tunnell - A Giant Pioneer
Tunnell became the first African American to play for the Giants. He was also the first African American to be elected to the Pro Footbal...   » Read the article

Encyclopedia - Carpal Tunnel Syndrome: Encyclopedia Ii - Carpal Tunnel Syndrome - Causes
Some cases of carpal tunnel syndrome are due to work-related cumulative trauma of the wrist. It is commonly caused by strain placed on th...   » Read the article

Encyclopedia - Carpal Tunnel Syndrome: Encyclopedia Ii - Carpal Tunnel Syndrome - Diagnosis
There are two easy methods to test for carpal tunnel syndrome. One is squeezing or clenching the hand and noticing a lack of strength. A ...   » Read the article

Encyclopedia - Holland Tunnel Fire: Encyclopedia Ii - Holland Tunnel Fire - Tunnel Ventilation
At 9:45 a.m. the tunnel ventilation system was turned to full extract and full supply in the zone of the fire (zone S4). The supply ...   » Read the article

Encyclopedia - Holland Tunnel Fire: Encyclopedia Ii - Holland Tunnel Fire - Timeline
At 8:30 a.m. a truck carrying eighty 55-gallon drums of carbon disulfide entered the south tunnel at the New Jersey portal. At the time, ...   » Read the article

Encyclopedia - The Time Tunnel: Encyclopedia Ii - The Time Tunnel - After The Original Run
Nevertheless, the number of websites and fan reminiscences attest to the series having made an impression on its audience despite only be...   » Read the article

Encyclopedia - List Of Rathole Tunnels: Encyclopedia Ii - List Of Rathole Tunnels - Overview
Rathole tunnels are generally long steeply graded single track narrow bores unfavourable winds prevent clearance of smoke type and numbe...   » Read the article

Encyclopedia - Tunnel Hill Georgia: Encyclopedia Ii - Tunnel Hill Georgia - Geography
Tunnel Hill is located at 34°50'45" North, 85°2'35" West (34.845934, -85.042955)GR1. According to the United States Census Bureau, the ...   » Read the article

Encyclopedia - Tunnel In The Sky: Encyclopedia Ii - Tunnel In The Sky - Plot Summary
A Malthusian catastrophe has been averted only by the invention of teleportation, called the "Ramsbotham jump," which is used to send Ea...   » Read the article

Encyclopedia - Eastern Harbour Tunnel: Encyclopedia Ii - Eastern Harbour Tunnel - Traffic
According to the operator, in 2003, a total number of 26,018,772 vehicles used the Eastern Harbour Tunnel. The average daily throughput w...   » Read the article

Encyclopedia - Roof And Tunnel Hacking: Encyclopedia Ii - Roof And Tunnel Hacking - Shafting
Older buildings, and sometimes newer buildings, have maintenance shafts designed to carry pipes and ducts, among other equipment, between...   » Read the article

Encyclopedia - List Of Tunnels In The United Kingdom: Encyclopedia Ii - List Of Tunnels In The United Kingdom - England
List of tunnels in the United Kingdom - Cornwall. Saltash Tunnel connecting the Tamar Bridge and the A38. List of tunnels in the Uni...   » Read the article

Encyclopedia - Carpal Tunnel Syndrome: Encyclopedia Ii - Carpal Tunnel Syndrome - Treatment And Prevention
There has been much discussion as to the most effective treatment for CTS. There are five basic categories: Wearing immobilizing braces ...   » Read the article

Encyclopedia - Carpal Tunnel Syndrome: Encyclopedia Ii - Carpal Tunnel Syndrome - Long Term Recovery
Long-term chronic carpal tunnel syndrome can result in permanent nerve damage. However, most carpal tunnel syndrome sufferers either chan...   » Read the article

Encyclopedia - Holland Tunnel Fire: Encyclopedia Ii - Holland Tunnel Fire - Injuries And Damage
In total, 66 people were injured, mostly by smoke inhalation. Of these, 27 were hospitalized. There were no deaths. The truck carrying ca...   » Read the article

Encyclopedia - Fort Mchenry Tunnel: Encyclopedia Ii - Fort Mchenry Tunnel - Background
Original plans called for an eight-lane bridge across the Baltimore Harbor to complete the final segment of Interstate 95 in Maryland. Ho...   » Read the article

Encyclopedia - Tunnel Diode: Encyclopedia Ii - Tunnel Diode - Reverse Bias Operation
When used in the reverse direction they are called back diodes and can act as fast rectifiers with zero offset voltage and extreme linear...   » Read the article

Encyclopedia - Tunnel Diode: Encyclopedia Ii - Tunnel Diode - Technical Comparisons
In a conventional semiconductor diode, conduction takes place while the PN junction is forward biased and blocks current flow when the ju...   » Read the article

Encyclopedia - List Of Tunnels In The United Kingdom: Encyclopedia Ii - List Of Tunnels In The United Kingdom - Wales
List of tunnels in the United Kingdom - Monmouthshire. Severn Tunnel Brynglas Tunnels, Newport (M4 motorway) Gibraltar Tunnels, Monmou...   » Read the article

Encyclopedia - Quantum Tunneling: Encyclopedia Ii - Quantum Tunneling - History
In the early 1900s radioactive materials were known to have characteristic exponential decay rates or half lives and the radiation emissi...   » Read the article

Encyclopedia - Quantum Tunnelling: Encyclopedia Ii - Quantum Tunnelling - History
In the early 1900s radioactive materials were known to have characteristic exponential decay rates or half lives and the radiation emissi...   » Read the article

Encyclopedia - Scanning Tunneling Microscope: Encyclopedia Ii - Scanning Tunneling Microscope - Overview
The STM is a non-optical microscope which employs principles of quantum mechanics. An atomically sharp probe (the tip) is moved over the ...   » Read the article

Encyclopedia - List Of Tunnels In The United Kingdom: Encyclopedia Ii - List Of Tunnels In The United Kingdom - Scotland
List of tunnels in the United Kingdom - Scottish Highlands. Nevis Tunnel, part of Lochaber hydroelectric scheme ... See also:List o...   » Read the article

Encyclopedia - Holland Tunnel Fire: Encyclopedia Ii - Holland Tunnel Fire - Emergency Response
At the time of the fire, the Holland Tunnel was operated by the Port Authority of New York, who had control of two other road tunnels, a ...   » Read the article

Encyclopedia - Hampton Roads Bridge-tunnel: Encyclopedia Ii - Hampton Roads Bridge-tunnel - History
The Hampton Roads Bridge-Tunnel has two 12-foot-wide (3.7 m) lanes each way, on separately built bridge-tunnel structures. The original t...   » Read the article

Encyclopedia - Bridges And Tunnels In New York City: Encyclopedia Ii - Bridges And Tunnels In New York City - Tunnels By Water Body
Bridges and tunnels in New York City - East River. Brooklyn-Battery Tunnel Queens-Midtown Tunnel Pennsylvania Tunnel and Terminal Rail...   » Read the article

Encyclopedia - Quantum Tunneling: Encyclopedia Ii - Quantum Tunneling - Semiclassical Calculation
Let us consider the time-independent Schrödinger equation for one particle, in one dimension, under the influence of a hill potential V(...   » Read the article

Encyclopedia - Light At The End Of The Tunnel: Encyclopedia Ii - Light At The End Of The Tunnel - Track Origins
“New Rose” was the band’s first single, released in 1976, with the cover of The Beatles’ “Help!” as the B-side. “Neat Neat ...   » Read the article

Encyclopedia - George Massey Tunnel: Encyclopedia Ii - George Massey Tunnel - Construction And Maintenance
The 630m long tunnel is made up of six precast concrete sections, each slightly over 100m long. These were floated into position by barge...   » Read the article

Encyclopedia - Channel Tunnel Rail Link: Encyclopedia Ii - Channel Tunnel Rail Link - Additional Information
After local protests, early plans were modified to put much more of the track in tunnel where it nears St Pancras. For example, the Link ...   » Read the article

Encyclopedia - Quantum Tunnelling: Encyclopedia Ii - Quantum Tunnelling - Semiclassical Calculation
Let us consider the time-independent Schrödinger equation for one particle, in one dimension, under the influence of a hill potential V(...   » Read the article

Encyclopedia - Scanning Tunneling Microscope: Encyclopedia Ii - Scanning Tunneling Microscope - Use Of The Stm
The scanning tunneling microscope is one of the most important tools for surface physics and surface chemistry, where it shows the struct...   » Read the article

Encyclopedia - Channel Tunnel Rail Link: Encyclopedia Ii - Channel Tunnel Rail Link - The Project
Section 1 of the CTRL, a 46 mile (74 km) section of high-speed track from the Channel Tunnel to Fawkham Junction in north Kent,...   » Read the article

Encyclopedia - Chesapeake Bay Bridge-tunnel: Encyclopedia Ii - Chesapeake Bay Bridge-tunnel - Facts And Figures
The CBBT is 17.6 miles (28.3 km) long from shore to shore, crossing what is essentially an ocean strait. Including land-approach hig...   » Read the article

Encyclopedia - Chesapeake Bay Bridge-tunnel: Encyclopedia Ii - Chesapeake Bay Bridge-tunnel - Ferry System
From the early 1930s to 1954, Virginia Ferry Corporation a privately owned public service company managed scheduled vehicular (car, bus, ...   » Read the article

Encyclopedia - Bridges And Tunnels In New York City: Encyclopedia Ii - Bridges And Tunnels In New York City - Bridges By Water Body
Bridges and tunnels in New York City - East River. From north to south: Throgs Neck Bridge Bronx-Whitestone Bridge Rikers Island Bridg...   » Read the article

Encyclopedia - Pennsylvania Tunnel And Terminal Railroad: Encyclopedia Ii - Pennsylvania Tunnel And Terminal Railroad - History
The company was formed on June 26, 1907 as a consolidation of the Pennsylvania, New Jersey and New York Railroad and the Pennsylvania, Ne...   » Read the article

Encyclopedia - Chesapeake Bay Bridge-tunnel: Encyclopedia Ii - Chesapeake Bay Bridge-tunnel - One Of The Seven Engineering Wonders Of The Modern World
Following the CBBT's opening in 1964, it was selected by the American Society of Civil Engineers (ASCE) as "One of the Seven Engineering ...   » Read the article

Encyclopedia - Chesapeake Bay Bridge-tunnel: Encyclopedia Ii - Chesapeake Bay Bridge-tunnel - Studying And Building A Fixed Crossing
In 1956, the General Assembly authorized the Ferry Commission to conduct feasibility studies for the construction of a fixed crossing. Th...   » Read the article

Dictionary - Tunnels Of Set: Mysticism Magick Dictionary On Tunnels Of Set
TUNNELS OF SET These are the 22 reverse Tarot paths on the Tree of Death, as proposed by Crowley and expanded by Grant, who calls them...   » Read the article

Dictionary - Reality-tunnel: Mysticism Magick Dictionary On Reality-tunnel
REALITY-TUNNEL R.A. Wilson: "An emic reality established by a vivid metaphor and transmitted through symbolism across generations...   » Read the article

Dictionary - Dream Interpretation Tunnel: Dream Interpretation Dictionary - Tunnel
  Tunnel To dream of going through a tunnel is bad for those in business and in love. To see a train coming towards you while ...   » Read the article

Dictionary - Meaning Of Dreams About Tunnel: Dream Interpretation Dictionary - Tunnel
  Tunnel When interpreting this dream, consider all of the details and the quality of your experience. Did you see a light at the...   » Read the article

Dictionary - Tunnel Dream Symbol: Dreams Interpretation Dictionary - Tunnel
Tunnel Dream Symbols: A symbol that might be interpreted as meaning that you are coming out of depression or a time of anxiety in your...   » Read the article

Dictionary - Tunnel Dream Symbol: Dreams Interpretation Dictionary - Tunnel
Tunnel Seeing a tunnel in your dream, represents the vagina, womb, and birth. Thus it may refer to a need for security and nurturance...   » Read the article

Dictionary - Tunnel Dreams Symbol: Christian Dream Interpretation Dictionary - Tunnel
Tunnel: A passageway; time of transition; a dark and troubling event. (1 Cor. 10:13)   (Source: Tehillah Ministries)   Relat...   » Read the article

Encyclopedia - Tunnel: Encyclopedia Ii - Tunnel - Artificial Tunnels
Overbridges can sometimes be built by covering a road or river or railway with brick or still arches, and then levelling the surface with...   » Read the article

Encyclopedia - Tunnel: Encyclopedia Ii - Tunnel - Choice Of Tunnels Vs. Bridges
For water crossings, a tunnel is generally more costly to construct than a bridge. However, navigational considerations may limit the use...   » Read the article

Encyclopedia - Tunnel: Encyclopedia Ii - Tunnel - Construction
Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over. Strong supporting beams...   » Read the article