Stock Photo - Light Alloy Craft Halves Running Costs: Survey Vessel For Pakistan -- A light alloy survey vessel of a stressed-skin construction and teak-built equivalent have proved the value of new techniques in the building of small craft.At Bideford, in Devonshire, England, a light alloy vessel for light-draught survey work has been built which may well be a valuable object-lesson to boat-builders the world over. A teak equivalent has been built elsewhere and the following comparisons and up to a virtual halving of operating costs. Of the same size and for the same requirements, the teak vessel displaces 65 tons; draught 4ft. 6 ins., total horse-power 260, speed 12 knots; the light alloy craft displaces 21 tons, draws two feet nine inches and with 130 horse-power makes 13.5 knots. February 28, 1952. (Photo by United Kingdom Information Service).