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1926 The oil tanker, BRITISH INVENTOR, was the first vessel to be constructed on the Isherwood bracketless system.
The machinery installation, which is fitted aft, comprises a single set of triple-expansion engines, designed to give the vessel a speed of 11 knots. Steam is raised in three cylindrical boilers fitted with Howden's forced draught and arranged for oil burning.
The interest in this vessel lies with the bracketless system of ship construction, recently introduced by Sir Joseph William Isherwood. In it the flanged brackets at the bulkheads, which are associated with the usual longitudinal Isherwood framing, are entirely avoided by a rearrangement of the structural members of the hull. The ends of the longitudinals for the decks, sides and bottom are simply snipped off, resulting in a very considerable simplification of the plating and riveting work throughout the ship.
During the trials, although the vessel was run at a speed of 11 1/2 knots, there was, we learn, a marked absence of vibration, while the deflection tests which were made by Sir Joseph William Isherwood at Jarrow proved entirely satisfactory. Some motor tankers of this new type are to be built in both America and Norway.
Length - 447ft. Beam 57ft. 8in. Designed to carry 10,650 tons deadweight, on a moderate draught.