| Constance Tipper Her speciality was in the strength of metals, and the way in which this 
        affected engineering problems. Her major contribution was during the Second 
        World War investigating the causes of brittle fracture in Liberty Ships. 
 A fractured Liberty Ship Liberty Ships were the first all-welded pre-fabricated cargo ships and 
        were mass produced in the United States. 2,751 Liberty Ships were built 
        between 1941 and 1945. Only two now remain afloat. Professor John Baker, who was Head of Engineering at that time was asked 
        to launch an investigation into the reasons why these ships were breaking 
        up so he brought Constance Tipper in as the technical expert.  
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