Clifton Observatory () is a former mill, now used as an observatory, located on

Clifton Down Clifton Down is an area of public open space in Bristol, England, north of the village of Clifton. With its neighbour Durdham Down to the northeast, it constitutes the large area known as The Downs, much used for leisure including walking and ...

, close to the

Clifton Suspension Bridge The Clifton Suspension Bridge is a suspension bridge spanning the Avon Gorge and the River Avon, linking Clifton in Bristol to Leigh Woods in North Somerset. Since opening in 1864, it has been a toll bridge, the income from which provides f ...

, Bristol, England. The building was erected, with the permission of the Society of Merchant Venturers, as a

windmill A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, specifically to mill grain (gristmills), but the term is also extended to windpumps, wind turbines, and other applications, in some ...

for corn in 1766 and later converted to the grinding of

snuff Snuff may refer to: Tobacco * Snuff (tobacco), fine-ground tobacco, sniffed into the nose ** Moist snuff or dipping tobacco ** Creamy snuff, an Indian tobacco paste Media and entertainment * Snuff film, a type of film that shows a murder Literat ...

, when it became known as 'The Snuff Mill'. This was damaged by fire on 30 October 1777, when the sails were left turning during a gale and caused the equipment to catch alight. It was then derelict for 52 years until in 1828 William West, an artist, rented the old mill, for 5 shillings (25p) a year, as a studio. In 1977, the Merchant Venturers sold the observatory to Honorbrook Inns; however, they were obliged to maintain public access to the camera obscura whose ownership was retained by the Merchant Venturers. It has been designated by

English Heritage English Heritage (officially the English Heritage Trust) is a charity that manages over 400 historic monuments, buildings and places. These include prehistoric sites, medieval castles, Roman forts and country houses. The charity states that i ...

as a grade II*

listed building In the United Kingdom, a listed building or listed structure is one that has been placed on one of the four statutory lists maintained by Historic England in England, Historic Environment Scotland in Scotland, in Wales, and the Northern Irel ...

and is on the Buildings at Risk Register. In February 2015 the Observatory was bought by Ian Johnson, a local Clifton-born entrepreneur, who also owns the

Clifton Rocks Railway The Clifton Rocks Railway was an underground funicular railway in Bristol, England, linking Clifton at the top to Hotwells and Bristol Harbour at the bottom of the Avon Gorge in a tunnel cut through the limestone cliffs. The upper station is ...

and th
Wellhead cocktail bar

Camera obscura

West installed telescopes and a

camera obscura A camera obscura (; ) is a darkened room with a small hole or lens at one side through which an image is projected onto a wall or table opposite the hole. ''Camera obscura'' can also refer to analogous constructions such as a box or tent in w ...

, which were used by artists of the

Bristol School The Bristol School (or Bristol School of Artists) is a term applied retrospectively to describe the informal association and works of a group of artists working in Bristol, England, in the early 19th century. It was mainly active in the 1820 ...

to draw the

Avon Gorge The Avon Gorge () is a 1.5-mile (2.5-kilometre) long gorge on the River Avon in Bristol, England. The gorge runs south to north through a limestone ridge west of Bristol city centre, and about 3 miles (5 km) from the mouth of the ...

and

Leigh Woods Leigh Woods is a area of woodland on the south-west side of the Avon Gorge, close to the Clifton Suspension Bridge, within North Somerset opposite the English city of Bristol and north of the Ashton Court estate, of which it formed a part. St ...

on the opposite side. Many examples of these paintings can be seen in

Bristol City Museum and Art Gallery Bristol Museum & Art Gallery is a large museum and art gallery in Bristol, England. The museum is situated in Clifton, about from the city centre. As part of Bristol Culture it is run by the Bristol City Council with no entrance fee. It holds ...

. The pictures which originated from images within the camera obscura he called 'photogenic drawing' and were based on the work of

William Fox Talbot William Henry Fox Talbot FRS FRSE FRAS (; 11 February 180017 September 1877) was an English scientist, inventor, and photography pioneer who invented the salted paper and calotype processes, precursors to photographic processes of the later 1 ...

. A 5" (13 cm)

convex lens A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements'') ...

and sloping

mirror A mirror or looking glass is an object that reflects an image. Light that bounces off a mirror will show an image of whatever is in front of it, when focused through the lens of the eye or a camera. Mirrors reverse the direction of the im ...

were installed on the top of the tower; these project the panoramic view vertically downward into the darkened room below. Visitors view the true image (not a mirror image) on a fixed circular table 5 feet (1.5m) in diameter, with a concave metal surface, and turn the mirror by hand to change the direction of view. It has been placed on the top of Clifton Tower since 1828.

Cave

West also built a tunnel from the Observatory to St Vincent's Cave (also known as Ghyston's Cave or Giants' Cave), which opens onto St Vincent's Rocks on the cliff face, above the floor of the Avon gorge and below the cliff top. The tunnel, which is long, took two years to build at a cost of £1300, and first opened to the public in 1837. This cave was first mentioned as being a chapel in the year AD 305 and excavations, in which

Romano-British The Romano-British culture arose in Britain under the Roman Empire following the Roman conquest in AD 43 and the creation of the province of Britannia. It arose as a fusion of the imported Roman culture with that of the indigenous Britons, ...

pottery Pottery is the process and the products of forming vessels and other objects with clay and other ceramic materials, which are fired at high temperatures to give them a hard and durable form. Major types include earthenware, stoneware and ...

has been found, have revealed that it has been both a holy place and a place of refuge at various times in its history. Although the cave is in

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...

, there are few formations in the natural passages.

References

External links

Clifton Observatory
* {{DEFAULTSORT:Observatory, Bristol Industrial buildings completed in 1766 Grade II* listed buildings in Bristol Structures on the Heritage at Risk register The Downs, Bristol Camera obscuras Buildings and structures in Clifton, Bristol Observation towers in the United Kingdom

Camera obscura

Cave

See also

References

External links