M ermaid and Wreck R eef shipwreck objects
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Transcript of M ermaid and Wreck R eef shipwreck objects
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Mermaid and Wreck Reef shipwreck objects
pulley sheath on the seafloor, Mermaid wreck site http://silentworldfoundation.org.au/mermaid.html
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Silentworld Foundation• Foundation objectives
One of Silentworld’s research vessels at anchor in the Pacific Islandshttp://silentworldfoundation.org.au/other-expeditions.html
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Wreck Reef expedition• Team members
http://silentworldfoundation.org.au/wreck-reef.html
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Wreck Reef
http://en.wikipedia.org/wiki/Wreck_Reefs
• Location• 1803 wrecks of Porpoise and Cato
Wreck Reef
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Wreck Reef• Expedition objectives
• Four wrecks: Cato, HMS Porpoise, Mahaica, Anne
anchor from the wreck of the Porpoise on the sea floor http://anmm.wordpress.com/category/maritime-archaeology/wreck-reefs-expedition/
expedition team off Porpoise Cayhttp://anmm.wordpress.com/category/maritime-archaeology/wreck-reefs-expedition/
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Mermaid• Location • 1826 wreck
of HMCS Mermaid
Surveying the wreck of Mermaidhttp://silentworldfoundation.org.au/mermaid.html
Frankland Islands
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Objectshttp://silentworldfoundation.org.au/wreck-reef.html
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Handmade bricks joined by mortar
Copper alloydrawer handles
Copper sheathing
Lead shot ball
Canister shot
Bilge pump housing
Block of coal
Glass shards
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Desalination baths for copper, glass and ceramic
glass
ceramic
copper
• Copper in 2.5% w/v sodium sesquicarbonate solutions• Ceramics and glass in deionised water only
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Coal and lead in long term storage
• Not treated• Documentation and monitoring• Climate controlled storage• Museum quality storage materials
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Canister shot• Anti-personnel
ammunition designed to be shot from a cannon
• Complex conservation issues
• Thick marine concretion• Unknown material types• Composite object
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Canister shot x-ray• Industrial x-ray• Exterior enclosure and shot visible• Materials not positively identified
Scanned x-ray of whole object showing small spherical shot inside a canister
Detail showing the canister and shot ball protruding through canister wall. Canister has presumably corroded through.
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Cutting open• Cut open with a circular saw
• Great majority of questions answered as object becomes visible and directly analysable
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XRF (X-ray Fluorescence)• Australian Museum Bruker XRF instrument
• Iron only detected
XRF analysis of a shot ball
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Canister shot treatment• Desalination
• 2% w/v sodium sulphite
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Conclusion
Conrad Martens Mermaid off Cape Banks December 4 1820, ca. 1840 NLA collection http://nla.gov.au/nla.pic-an2390741