A close view of timber blocks supporting the hull of the armoured cruiser Black Prince (1904) during construction on the slip at theThames Iron Works Shipbuilding & Engineering Co. Ltd shipyard at Blackwall, London. The photographer is holding his camera at ground level showing the sliding timbers on the ways and a large stack of timber blocks being used to support the hull. They are stacked in alternate rows athwartships and fore-and-aft and are angled in to the hull. A vertical format negative.