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    The Lead Bulb

    UncategorizedBy AdministratorJune 27, 2018Leave a comment

    The lead bulb for the keel was made by sand casting – a technique developed in the Bronze Age. (Everything I do here is dangerous!) The bulb model was 3D-printed in two symmetrical parts. The first part is placed on a flat surface and prepared to be buried in “green sand”. The other half of…

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