Derwent Light (Iron Pot)

1883

1833

Australia

Consolidated Marine Board

4th order

Revolving

Active

Fl (3) W 10 secs

White obloid tower with red horizontal stripe

The Derwent Lighthouse on Iron Pot Island is known for its unique obloid (square) shape and its blackwood staircase. The Derwent Light also known as the Iron Pot. Iron Pot Lighthouse is significant for several reasons - it was the first lighthouse built in Tasmania, it is the second oldest lighthouse built in Australia, it is the oldest continuously operating lighthouse in Australia, & it was the first to utilise a locally made optic, and was the first Australian lighthouse to use solar power.

Origin of the name Iron Pot continues to be a mystery. One theory is that whalers’ pots were left on the island from the early eighteenth century and this gave the island its name. Another is that it takes its name from the curiously formed pot like holes in island. And a third theory is that there was a whale oil fired beacon in old whaler’s tri-pot.

The barren rocky island is small, about 0.4 hectare in area and marks the entrance to the Derwent River.

The first beacon and signal station was manned by convicts and is believed to be on the nearby Betsy Island before being relocated to Iron Pot Island.

Several significant shipwrecks and groundings including the Bombay (1830), SS Lintrose (1832) and the Princess Royal (1832) with 300 free women settlers on board caused agitation from merchants and residents in Hobart Town for a light to be erected.

Lieutenant Hill, the Port Officer, drew up plans for a wooden light, which was approved and erected in 1832. It had a timber crossbar and the locally made apparatus was raised and lowered by hand. The light was manned by a keeper and two convict assistants living in harsh conditions in tents.

John Lee Archer inspected the light and was dissatisfied with arrangement of light and recommended it be upgraded. His rubble tower was built within the timber framework of the existing tower and was completed and operating in 1833. Despite these improvements, the light apparatus still failed to meet up with expectation and in 1835 a new lamp was fitted. Ship owners still complained the light was inadequate but it was not upgraded. Finally, in 1851, another new apparatus installed, but the ship owners still considered the light unsatisfactory. In 1858 the newly formed Hobart Marine Board took control of light. By now a stone hut had been built for the keepers.

A curious episode happened in 1862 when one of the keeper’s children was claimed to have found a high grade gold bearing quartz nugget. The Iron Pot gold rush was on within hours of their father’s report, however the 200 potential diggers were disappointed with hours of their arrival as no further gold was apparent.

Owing to the confined space on the Islet, the Board in 1882 entered into an Agreement for the occupation of an area on the mainland which was used for many years as a garden by the keepers at the lighthouse.

Then, in 1884 a new Chance Bros colza burning apparatus was installed. To mark the new era, in 1884, the Marine Board renamed Iron Pot Lighthouse, the ‘Derwent Lighthouse’. The name never really took, and even today on some official documents the lighthouse is still referred to as ‘The Iron Pot’.

Keepers' conditions were improved in 1885 when a new two story headkeeper’s cottage was constructed. It was unusual to have two storey cottages on lightstation but on the 0.4 hectare island space was a premium.

The first and only person born on the island was baby Essie (or Elsie) Margaret Roberts, born to the headkeeper’s wife in 1895.

In the same year, 1895, a huge storm arose, driving waves right over the island. The assistant keeper’s quarters were abandoned for the safety of the headkeeper’s cottage as they flooded. Full water tanks, sheds and a stone retaining wall were washed away. It is believed that the keeper and families then retreated to lighthouse. In the morning, there was devastation everywhere. There was even kelp clinging to uppermost rails of the lighthouse, over 20 metres above sea level. There had been no loss of life and the keepers had worked all night and kept the light going.

1904 saw the installed incandescent petroleum burner. It was the first light in Australia to use vapourised kerosene as illuminant.

As part of the agreement controlling coastal lights, Iron Pot Lighthouse was handed over to Commonwealth in 1915. Following recommendations made upon its takeover, in 1920, the fixed white light was converted to revolving white light by inserting a revolving cylinder.

The apparatus was also converted to acetylene gas, ending an era spanning 88 years of constant toil and service to the light.

In 1921, the keepers were withdrawn and the keepers’ cottages were sold for removal. The material from the cottages is said to have been recycled into other buildings around Hobart.

As a result of local vessels objecting to the lighthouse levy imposed by the Commonwealth the Light was eventually transferred back to the Hobart Marine Board in 1925 and no further levies were charged. However, under this arrangement, the light continued to be maintained by the Commonwealth Lighthouse Service, at the Marine Board’s expense until 1976. To keep costs down upon resuming responsibility for maintenance of light, the Marine Board converted from acetylene gas to solar in 1977 – the first such conversion in Australia.

The light celebrated its centenary in 1932.

Marine & Safety Tasmania (MAST)

good

Closed

Closed

-43.03 S 147.25 E

1. https://lighthouses.org.au/tas/iron-pot-lighthouse/
2. https://www.ibiblio.org/lighthouse/tas.htm

Pennecott Wilderness Journeys run cruises daily from Hobart

ARLHS AUS-095; Admiralty K3622; NGA 6728.

1. https://lighthouses.org.au/tas/iron-pot-lighthouse/
2. Chance Lighthouses (1856-1917) (61 years), David Encill's list 1856-95: Iron Pot (or Derwent Light); 1883; Lights of the fourth order (fixed)