Description
The Carley float was formed from a length of copper or steel tubing 12-20 inches (30-50 cm) in diameter bent into an oval ring. The ring was surrounded by a buoyant mass of kapok or cork, and then covered with a layer of canvas rendered waterproof via painting or doping. The metal tube was divided into waterproof compartments with vertical baffles. The raft was thus rigid, and could remain buoyant, floating equally well with either side uppermost, even if the waterproof outer was punctured. The floor of the raft was made from a wood or webbing grating. Boxes containing paddles, water, rations and survival equipment were lashed to the floor grating. Men could either sit around the rim of the raft, or, if in the water, cling to rope loops strung around its edge. The largest model could accommodate up to fifty men, half inside the raft, and the others in the water holding onto the ropes.
Some variants included a calcium flare that would automatically ignite on immersion in water. The flare could however expose a raft to hostile fire, as then-Lt. Stuart Bonham Carter found during the 1918 Zeebrugge Raid as he escaped the scuttled blockship HMS Intrepid. Only the smoke of the burning vessel behind him prevented him from being targeted.
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