Green Cape Lighthouse

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Green Cape Lighthouse (original)
Green Cape Lighthouse.jpg
Green Cape Lighthouse
Green Cape Lighthouse is located in New South Wales
Green Cape Lighthouse
Location Green Cape, New South Wales, Australia
Coordinates 37°15′41.01″S 150°2′57.58″E / 37.2613917°S 150.0493278°E / -37.2613917; 150.0493278Coordinates: 37°15′41.01″S 150°2′57.58″E / 37.2613917°S 150.0493278°E / -37.2613917; 150.0493278
Year first lit 1883
Deactivated 1992
Construction Concrete
Tower shape Square pyramidal base with octagonal tower
Markings / pattern White
Height 29 metres (95 ft)
Focal height 44 metres (144 ft)
Original lens 1st order Fresnel lens
Intensity 1,000,000 cd
Range 40 kilometres (25 mi)
Characteristic two white flashes every 10s
ARLHS number AUS-085

The Green Cape Lighthouse is a lighthouse located at the tip of Green Cape, a headland forming the northern boundary of Disaster Bay, in southern New South Wales, Australia. It is the southernmost lighthouse in New South Wales and Australia's first lighthouse built in concrete. At 29 metres (95 ft) it is also the second tallest lighthouse in New South Wales.[1] It marks Green Cape on the northerly shore hugging sailing course.

History[edit]

Green Cape, 1902
Original plans of the lighthouse.

The need for lighthouse was approved in 1873, following a series of wrecks on the southern shore. After rounding Cape Howe, northerly ships would hug the shore to avoid the East Australian Current. Green Cape was the first major projection they would encounter. Original tenders were for a stone lighthouse and rubble quarters. However, with the soft local sedimentary, no one tendered. In 1870 the specifications were changed to concrete and a budget of £17,000 AUD was set.

The tower was designed by James Barnet in 1880[2] and the contract was awarded to Albert Aspinall who quoted £12,936 in December 1880. The tender was for the concrete tower, two houses of double brick with cement render, and associated structures.

Aspinall first had to find a way to move the materials from Eden to the site. The nearest safe anchorage was in Bittangabee Bay, north along the coast from Green Cape, where he built his storeroom and jetty. He then spent five months building a 7 kilometres (4.3 mi) wooden tramway from Bittangabee Bay to the cape. Materials were transported to the site on wooden trolleys pulled by horses. This first phase was complete in June 1881, and Aspinall commenced the construction.

Major problems were encountered when the site was found to lie on a 6 metres (20 ft)[3] white clay belt, forcing the foundation to be dug to 9 metres (30 ft). Work stopped in June 1883 due to financial difficulties, and Aspinall's creditors completed the project, which was lit on 1 November 1883.

The original apparatus, still mounted in the lantern, is a Chance Bros. 1st order revolving Fresnel lens dioptric. It's light characteristic was one flash every 50 seconds[4] and it was visible to 19 nautical miles (35 km; 22 mi).[5] The light source was a four-wick kerosene-burning lamp with an intensity of 100,000 cd.

In 1910 the light source was replaced with a Douglas vaporised kerosene burner and a glass chimney around a silk mantle, made by Chance Bros.

In 1913 it was recommended to change the light characteristic to a white flash every 10 seconds. However, it took 16 years until this recommendation was accepted, in 1926. Previous to that, in 1923, light source was upgraded to a Ford Schmidt burner which increased the intensity of the light to 327,000 cd.

In 1962 the tower was electrified with diesel generators serving as the power source. The manual winding system was also replaced with an electric motor. The lightglove used provided a light intensity of 475,000 cd. In 1967 improved generators were installed together with a 1000 W Tungsten-halogen lamp with an intensity of 1,000,00 cd, visible over 20 nautical miles (37 km; 23 mi). The light characteristic was changed to two flashes every ten seconds. At some later point the power source was changed to the mains electricity.

Green Cape Light (current)
Green Cape Lighthouse and skeletal.jpg
Green Cape Light. The current light is the skeletal tower to the right of the original tower.
Location Green Cape, New South Wales, Australia
Year first constructed 1992
Construction skeletal
Tower shape square
Height 49 feet (15 m)[6]
Focal height 118 feet (36 m)[7]
Intensity 37,500 cd
Range 17 nautical miles (31 km; 20 mi)
Characteristic two white flashes every 15s
Admiralty number K2570
NGA number 6588
ARLHS number AUS-260

In 1992[8] a solar powered lens on a modern lattice skeletal steel tower was constructed right next to the historic tower, and the light was officially turned off in 17 March 1992. The new light operates a 36 W lamp with an intensity of 37,500 cd.

In February 2011, the lighthouse was recognised as an "Engineering Heritage National Landmark" by Engineers Australia.[9]

Structure[edit]

The original tower is built of concrete, and at the time it was the largest mass concrete structure in New South Wales. The form, octagonal on a square base, was chosen to ease the construction of the formwork.

The tower has a bluestone gallery. A small room is attached to the western side, originally meant to be an oil store.

Site operation[edit]

The current light is operated by the Australian Maritime Safety Authority. The site is managed by the Department of Environment, Climate Change and Water as part of the Ben Boyd National Park.

Visiting[edit]

The grounds are open to the public, and the tower is open to guided tours on some days of the week. Reservations for the guided tours are recommended. Accommodations are available in the two assistant keepers' cottages which sleep up to six people each.

See also[edit]

Notes[edit]

  1. ^ According to "Lighthouses of Australia". "DECCW - Ben Boyd National Park - Accommodation" says it is the tallest.
  2. ^ "Item details". recordsearch.naa.gov.au. Retrieved 31 August 2010. 
  3. ^ According to "Lighthouses of Australia". More than 7m according to Steve Merson
  4. ^ According to Steve Merson. 60 seconds according to "SeaSide Lights"
  5. ^ According to "SeaSide Lights" and Steve Merson. 34km according to "Lighthouses of America".
  6. ^ According to Directory of Lighthouses. "SeaSide Lights" list the height of the old light, 95 feet (29 m), with the focal height of the new one, 118 feet (36 m).
  7. ^ According to List of Lights. "39 m (118 ft)" according to Directory of Lighthouses, which is a unit conversion error.
  8. ^ According to all sources except "SeaSide Lights" which says 1998.
  9. ^ "Lighthouse receives national recognition". www.abc.net.au. Retrieved 17 February 2011. 

References[edit]

External links[edit]