The inventions of Bill Hamilton dominate this instalment of long-running cinema series Pictorial Parade. Hamilton tests his pioneering jet boat on Canterbury's Ohau River, while new inventions including a hydraulic digger are put to the test on the hard rocky soils at Irishman Creek. Meanwhile on the production line in Christchurch, engineers and machinists are hard at work getting graders and loaders in top working order. Also featured is a new diesel railcar on New Zealand’s train network, and the crew of the HMNZS Hawea and HMNZS Black Prince training in the Cook Strait.