Laser survey

{{ safesubst:#invoke:Unsubst||$N=Update |date=__DATE__ |$B= {{#invoke:Message box|ambox}} }} As an initial step in the process of deconstruction of the City of Adelaide, the Scottish Maritime Museum is commissioning a laser scan survey of the vessel as has been used to inform work on the 'SS Great Britain'. The survey, apart from assisting with the location of precise cutting points, can be used at a later date as part of the interpretation of the sections of the vessel to be saved.

Survey

At the same time as the laser survey a fully qualified naval architect will re-examine the vessel and prepare a report noting any variations since the Tritech survey. Robert Blane of Tritech and Ken Fulford of Fergusons Shipbuilders have agreed to undertake this survey work. They will be assisted by a qualified archaeologist. These surveys will add additional information to the sum of knowledge of the vessel and fully inform the preparation of the deconstruction tender documents.

Once the final laser survey work has been completed and added to the corpus of knowledge about the vessel’s structure a dismantling plan will be drawn up targeted specifically at those areas of the vessel where it is believed additional information can be obtained. This option still remains subject to the availability of sufficient funding to carry out the work.

The Scottish Maritime Museum has decided not to pursue a suggestion by National Historic Ships (Greenwich) that a midships section of the vessel be retained as the amount of space that the additional section would occupy is far greater than the museum has available. However, it is thought feasible to select one complete set of frames and associated beams from the midships section of the vessel and retain them for display at a later date. After the completion of the laser survey and study by the naval architect the set of frames in best condition will be selected. They will have to be cut into manageable sections for transportation and storage until such times as they can be displayed.

Internal hull laser survey work was scheduled to commence on the 22nd June 2009 with the external laser survey to be undertaken on 9th and 10th of July 2009. The laser survey information will also be made available to any parties wishing to submit an offer to remove the clipper whole.

Laser Scanning

The American Civil War was raging at the time that the City of Adelaide was being constructed, and on the night of 17 February 1864 the Confederate submarine H.L. Hunley embarked on a dangerous mission that would forever mark its place in history. That night the eight-man crew launched a successful attack that sank the USS Housatonic and the Hunley became the first submarine in history to sink an enemy ship in combat. The Hunley was sunk during the attack and the crew perished.

The Hunley Commission was created by the State of South Carolina to acquire, recover, and preserve the H.L. Hunley submarine for public display. The Hunley has been recovered and is undergoing conservation.

The submarine H. L. Hunley is seen in the image on the left below - an 1863 oil painting by Conrad Wise Chapman. The image on the right is from a laser scan of the recovered submarine after the salvage operation.

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How Laser Scanning Works

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Other Laser Scanning Examples

Adelaide Festival Centre Plaza

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Mystic Seaport - Charles W. Morgan

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References

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