Thursday, 5 June 2014

The dock in 3D and mystery objects

Please bear with me if you find you are unable to download and open the linked documents in this post. I am sailing uncharted waters here!

I have been hard at work this week in the recently excavated 1802 dock at the Nautical Museum in Castletown. At the bottom of the dock the archaeologists were obliged to leave, as found, a tangled mass of machinery and timbers stuck together under a heap of concrete (see my previous post entitled 'End of the dock dig'). It falls to me now to record, separate and remove from the dock the various parts of this concretion. To do this I have each day to drain the dock with a pump at low tide. Then I am using a compressed air chisel to remove the concrete bit by bit. It is a very laborious process and I've only just begun.
To record the stages of this work I am using close-range photogrammetry, otherwise understood as 3D modelling from photographs. Here is a link to a 3D scan in pdf format. The file is very large so you will have to DOWNLOAD THEN SAVE it before you can view it. Those of you with more basic computers may not be able to view the file even then. If this is you, I apologise.

3d Model: download me!
Meanwhile, here are two photographs of a mystery, unidentified object extracted from the mass in the dock, yesterday. 

The photographs show a pair of bevelled brass collars, two concentric brass tubes and a coiled, steel spring. At the top of the photos is mounted a kind of latch. We are very interested to hear from you if you think you might know what this is..... 

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