Construction of a concrete petrol barge, PD.25, at Barnstaple, Devon (?), 1918.
The raw material - close-up of a piece of concrete held in the hand. Travelling medium shot from a train pulling into a siding at the shipyard - seven months ago the area "consisted of open fields". Pan around interior of design office, with draughtsmen at work. Scenes during the construction of the ship: initial wooden frame built on the ways; network of reinforcing steel hull members added; concrete poured between inner and outer shells; laying down and painting of the deck; high-angle medium shot into the hold, showing dividing concrete bulkhead; reverse shot from hold to deck house containing steam winch; medium close-up of plate brackets which form the ship's knees. Workers stand on the deck of the completed vessel. The launch - long shot as PD.25 enters the water, and medium shots of the barge immediately after launching and at her moorings.