Tar Tunnel
Encyclopedia
The Tar Tunnel is located on the north bank of the River Severn
in the Ironbridge Gorge
at Coalport
, England
, and now forms part of the Ironbridge Gorge Museum Trust
.
Miners struck a gushing spring
of natural bitumen, a black treacle
-like substance, when digging the tunnel
in 1787, probably in connection with the nearby coal mine workings. It was a great curiosity in the 18th century and bitumen still oozes from the wall today. Its chief commercial use at the time was to treat and weatherproof rope
s and caulk wooden ship
s, but small amounts were processed and bottled as a remedy for rheumatism
.
River Severn
The River Severn is the longest river in Great Britain, at about , but the second longest on the British Isles, behind the River Shannon. It rises at an altitude of on Plynlimon, Ceredigion near Llanidloes, Powys, in the Cambrian Mountains of mid Wales...
in the Ironbridge Gorge
Ironbridge Gorge
The Ironbridge Gorge is a deep gorge formed by the River Severn in Shropshire, England.Originally called the Severn Gorge, the gorge now takes its name from its famous Iron Bridge, the first iron bridge of its kind in the world, and a monument to the industry that began there...
at Coalport
Coalport
Coalport is a village in Shropshire, now part of the new town of Telford. It is located on the River Severn at , a mile downstream of Ironbridge...
, England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...
, and now forms part of the Ironbridge Gorge Museum Trust
Ironbridge Gorge Museum Trust
Ironbridge Gorge Museum Trust is an industrial heritage organisation which runs ten museums and manages 35 historic sites within the Ironbridge Gorge in Shropshire, England, widely considered as the birthplace of the Industrial Revolution....
.
Miners struck a gushing spring
Spring (hydrosphere)
A spring—also known as a rising or resurgence—is a component of the hydrosphere. Specifically, it is any natural situation where water flows to the surface of the earth from underground...
of natural bitumen, a black treacle
Molasses
Molasses is a viscous by-product of the processing of sugar cane, grapes or sugar beets into sugar. The word molasses comes from the Portuguese word melaço, which ultimately comes from mel, the Latin word for "honey". The quality of molasses depends on the maturity of the sugar cane or sugar beet,...
-like substance, when digging the tunnel
Tunnel
A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...
in 1787, probably in connection with the nearby coal mine workings. It was a great curiosity in the 18th century and bitumen still oozes from the wall today. Its chief commercial use at the time was to treat and weatherproof rope
Rope
A rope is a length of fibres, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength...
s and caulk wooden ship
Ship
Since the end of the age of sail a ship has been any large buoyant marine vessel. Ships are generally distinguished from boats based on size and cargo or passenger capacity. Ships are used on lakes, seas, and rivers for a variety of activities, such as the transport of people or goods, fishing,...
s, but small amounts were processed and bottled as a remedy for rheumatism
Rheumatism
Rheumatism or rheumatic disorder is a non-specific term for medical problems affecting the joints and connective tissue. The study of, and therapeutic interventions in, such disorders is called rheumatology.-Terminology:...
.