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Publication Details
| Published Date: | |
|---|---|
| Authors: | Richard A. Uhal, Steven D. Hand, Colleen Brady Cunniffe, Marcie Renner |
| Company: | CMSC |
| Print Format: | Technical Paper |
| Citation: | Richard A. Uhal, Steven D. Hand, Colleen Brady Cunniffe, Marcie Renner, "Multiple Reflection Techniques Used to Measure and Model a British Cannon Recovered from the Battle of Yorktown," The Journal of the CMSC, Vol. 1, No. 2, Autumn 2006 |
Abstract
The utilization of a noncontact laser radar, multiple-reflection measurement technique was employed to generate an accurate 3D model of an historic artifact, both on exterior and interior surfaces. The artifact scanned was a “four-pounder” British naval cannon from the deck of a supply ship ordered scuttled in the York River by General Charles Cornwallis just prior to his surrender to General George Washington at Yorktown, Virginia, in the fall of 1781. Measurements were taken directly, and with a single mirror on the entire exterior, while the interior bore was scanned using multiple mirror techniques. Difficulties encountered during the scanning process of the bore are described in this paper. Problems were both technical and environmental and include interior illumination, reference tooling ball acquisition, reflection angle and condensation. The data were aligned and processed with a final result being a watertight, polygonal model with an overall accuracy of ±100 µm (0.004 in.). This model has revealed interesting detail regarding eighteenth century armament design and period casting techniques and will be used as the baseline to compare the restored artifact to its recovered condition.
