Joseph Heap and Sons Ltd., Rice Millers Joseph Heap 1762-1833 was a sugar boiler trading with Barbados and Jamaica. In 1864, when rice shipments from the Carolinas were cut by the American Civil War, Heaps sent their Diamond H ships to lift a thousand tons of ‘Cargo’ rice for the family mill in Liverpool. In 1866, 364,000 tons of rice left Rangoon, Akyab, Bassien and Moulmein aboard