Stepping the mast of the Endeavour at the Royal Dockyard at Portsmouth . The task of stepping the huge steel mast of the yacht Endeavour , which has just been launched at Gosport , was completed with the assistance of a huge crane at the Royal Dockyard at Portsmouth . The Endeavour , Mr ' Tommy ' Sopwith ' s yacht will compete for the Americas Cup in September . Photo shows ; The crane lowering the huge steel mast into position in the Royal Dockyard at Portsmouth . 19 April 1934 30s, 30's, 1930s, 1930's, thirties, nineteen thirties