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Carley float

The Carley float is an invertible life raft designed by American inventor Horace Carley and patented in 1903, consisting of an oval-shaped ring formed from large-diameter copper or steel tubing divided into multiple watertight compartments, covered in buoyant materials such as or and wrapped in canvas, with a wooden slatted platform suspended inside by rope netting and an outer lifeline for gripping. It was developed following the 1898 sinking of the La Bourgogne, which highlighted the need for more reliable emergency flotation devices, and was produced by the Carley Life Float Company in . During , the Carley float served as the primary lifesaving equipment on British Commonwealth warships, merchant vessels, and other naval ships, stowed on decks, superstructures, or turrets for rapid deployment by slipping or lowering into the water. Available in sizes rated for 8 to 50 persons, it could support survivors both inside the ring and clinging to the exterior, remaining afloat regardless of orientation due to its compartmentalized design and air valves for testing. Its advantages included low cost, simplicity of construction, durability against damage, and ease of launch without mechanical aids, allowing it to exceed rated capacities in emergencies—such as holding 13 people on an 8-man float. However, the open design offered no shelter from elements like cold water or weather, limiting survival time in frigid conditions to as little as 30–90 minutes without rescue, and it required regular six-month inspections to maintain without repainting the . Notable incidents include its role in the 1941 sinking of HMAS Sydney, where a shrapnel-damaged float was recovered off , and the 1942–1943 ordeal of Chinese steward , who survived 133 days adrift on one in the South Atlantic after his ship was torpedoed. It also saved lives in convoy actions, such as 50 survivors from HMCS Louisburg in 1943 and 27 from HMCS Esquimalt in 1945, though many perished from exposure in North Atlantic sinkings like HMCS Guysborough. The Carley float remained in use until the mid-1950s, when it was largely replaced by inflatable life rafts and rigid dinghies offering better protection, but its legacy endures as a symbol of wartime maritime survival ingenuity.

History

Invention and Early Development

The Carley float was invented by Horace S. Carley (1838–1918), an American innovator with a diverse background that included service in the Civil War and early work as a whaler aboard a schooner at age 16. After the war, Carley pursued various trades, including interior decorating, music, and acting in minstrel shows, before turning his attention to maritime safety inventions informed by his seafaring experiences. Carley's design was spurred by high-profile maritime disasters in 1898, notably the collision of the French steamer La Bourgogne with the sailing ship Cromartyshire in dense fog off Nova Scotia, which claimed 549 lives due to chaotic lifeboat launches, and the sinking of the American steamer Portland in fog off Cape Cod, resulting in approximately 190 deaths. These events, along with earlier shipwrecks Carley had witnessed in his youth, underscored the critical need for a simple, rapidly deployable life-saving device that could be launched without specialized equipment amid panic and poor visibility. Carley secured U.S. Patent No. 734,118 on July 21, 1903, for his "life-raft," an improvement on his earlier 1899 patent (No. 627,979), describing an annular, self-righting float constructed from divided into multiple airtight compartments, encased in compressed , , and wire for puncture resistance. Assigned to the newly formed Carley Life Float Company in , the invention entered commercial production soon after, emphasizing its lightweight, collapsible structure suitable for quick storage and deployment on ships. In the early , demonstrations and tests highlighted the float's key features of invertibility—allowing it to self-right if capsized—and superior from its compartmentalized design, which maintained flotation even if sections were damaged. These trials validated its stability and ease of use, paving the way for its eventual widespread adoption by navies during .

Adoption and Use in World Wars

The Carley float saw initial adoption by the U.S. Navy as a principal device on warships starting from the First World War, serving as standard equipment alongside other navies including the British Royal Navy during the period from 1915 to . British naval records from the era document its use in scenarios, such as during destroyer engagements where crews relied on the floats for evacuation after abandon-ship orders. Its use expanded significantly during the Second World War from 1939 to 1945, becoming fitted as standard equipment across all major Allied warships and merchant vessels within the British Commonwealth fleets. The British and integrated it as the primary flotation device, as referenced in the Admiralty Manual of Seamanship (1956), which detailed its stowage, inspection, and deployment protocols for ongoing service. The Royal Canadian Navy also employed it extensively on convoy escorts and other vessels, valuing its simplicity for rapid deployment in emergencies. Notable incidents highlighted its role in wartime survivals and losses. In the sinking of the on July 30, 1945, by a Japanese , approximately 900 survivors initially floated in the Pacific, with many clinging to Carley floats and life jackets amid attacks and exposure over four days until . Similarly, following the engagement with the on November 19, 1941, where sank, damaged Carley floats were found adrift in the , recovered about 300 kilometers off , though no crew survived. Production scaled massively to meet wartime demands, with thousands manufactured by companies such as the Carley Life Float Company of and licensees in the UK and to equip naval and merchant fleets. The design's low cost and ease of nesting for storage facilitated this widespread distribution, ensuring availability on vessels ranging from cruisers to freighters.

Design and Construction

Materials and Components

The Carley float's core structure consisted of an oval-shaped ring formed from large-diameter , typically 12 to 20 inches in , bent into a continuous loop and divided into multiple watertight compartments by internal bulkheads to prevent sinking if punctured. These tubes were filled with buoyant materials such as compressed or to provide passive flotation without reliance on inflation, and included air valves for testing. Later wartime variations substituted tubing for enhanced durability in harsh marine environments. The frame was encased in a layer of or buoyant filler, then covered by one or more layers of heavy or fabric, often painted gray and treated with compounds to protect against and . This outer covering formed a seamless, invertible that allowed the to right itself if capsized, with no distinct "up" or "down" side. For occupant support, a removable served as the seating platform, constructed from wooden slats lashed together or suspended via netting that could be lowered into the water for stability. This design accommodated varying capacities depending on size, with standard naval models rated for 20 persons (typically 12 inside and 8 clinging outside). Essential attachments included rope fenders wrapped around the exterior for cushioning during handling or towing, painter lines secured to the frame for attachment to ships or vessels, and a deployable to maintain orientation in rough seas. Additional fittings, such as lifeline ropes with floats and lashings for emergency kits, were integrated directly into the structure without mechanical inflation mechanisms.

Dimensions and Capacity

The Carley float was constructed as an oval ring with typical outer dimensions measuring 6 feet by 10 feet (1.8 m by 3 m) in standard naval models, providing a compact yet robust structure for emergency use. The height of the float, determined by the diameter of the encircling tube, ranged from 1.5 to 2 feet (0.45 to 0.6 m), while the inner opening allowed for central access and positioning of survivors. Empty, the float weighed approximately 385 pounds (175 ), a load manageable by 2 to 3 members for positioning and deployment on board ship. This reflected of the metal tubing and buoyant filling, balancing durability with portability. Rated for 20 persons in standard naval models, the float's capacity could extend beyond this in emergencies, thanks to its excess from cork displacement. For instance, Admiralty-pattern 20-man floats accommodated 12 persons on the central platform with an additional 8 clinging to the lifeline. The invertible design further aided capacity by allowing use in any orientation without loss of flotation. Buoyancy derived primarily from the cork layer, which provided approximately 47 pounds of flotation per based on its volume. This ensured reliable support even under overload, without relying on air chambers alone. For shipboard storage, the floats were compact enough to be nested or stacked on rails, decks, turrets, or skids, or secured upright against bulkheads and superstructures for quick release.

Operation and Deployment

Launching Procedures

The launching procedures for a Carley float emphasized speed and simplicity to facilitate rapid abandonment of a distressed vessel during emergencies, such as in naval operations. Preparation involved securing the painter line—a strong attached to the float—to a fixed point on the ship's , ensuring the device remained tethered and accessible after entry into the water. Attachments, including slings and stowage fittings, were verified for integrity prior to release; routine inspections occurred every six months to confirm the float's and structural condition, avoiding repainting the canvas covering that could compromise . Release mechanisms relied on gravity-assisted drops rather than complex davits, allowing deployment from various deck positions, often using a toggle pin and for quick release. Floats were typically stored nested in sets on open decks, turrets, skids, or upright against railings and screens, often slung from the or shrouds using a three-legged system—two legs shackled to eyebolts for stability and the third secured by a slip for quick detachment. To launch, crew members pulled the slip or manually pushed the float overboard, enabling it to fall clear of the in seconds without specialized . This permitted tossing the relatively lightweight float (approximately 55–100 pounds when empty, varying by size) directly into the sea from railings, prioritizing immediacy over precision in chaotic conditions. Upon water entry, the Carley float's inversion feature ensured operational readiness regardless of orientation, as its balanced distribution of cork buoyancy and watertight copper tube compartments allowed it to float stably either right side up or upside down, with no need for manual righting. The weighted wooden grating floor and rope netting extended slightly below the for stability, while the painter line kept the float proximate to the sinking . Post-launch, survivors boarded by grasping the encircling ropes and over the inner , with the open doughnut-shaped accommodating quick entry even in rough seas; the buoyant materials, including layered and , maintained flotation for up to 15–20 persons despite rated capacities as low as 8 for smaller models. Royal Navy training protocols, as detailed in seamanship manuals, stressed drills for swift execution of these procedures, simulating abandonment scenarios to achieve deployment in under a minute per float and reinforcing the importance of painter management to prevent loss at sea. These exercises were conducted regularly aboard warships to build muscle memory, ensuring crew proficiency amid the high-stakes environment of wartime convoy duties.

Usage and Survival Techniques

Once afloat, survivors boarded the Carley float by grasping the surrounding lifelines and pulling themselves onto the central wooden , which served as a platform for seating up to the rated capacity—typically 12 individuals inside for a 20-man , with additional personnel clinging to beckets on the outer rope netting to maintain . Weight distribution was critical; occupants positioned themselves evenly around the grating to prevent tipping in rough seas, as uneven loading could cause the float to list or capsize. To protect against exposure, survivors huddled closely on the to share body heat and reduce risk, particularly in cold waters, while the minimal supplies stored in an attached , including tins of and basic emergency rations sufficient for short-term use. Signaling for rescue involved deploying flares if available, using mirrors to reflect toward passing or vessels, or activating the float's buoyant for nighttime visibility. For navigation, a was streamed from the float to face the wind and , stabilizing it and preventing broaching, while survivors propelled it manually using hands, improvised oars from , or the two provided wooden paddles lashed with lanyards if necessary, though manuals advised against sustained paddling to conserve and await ; aiming toward known shipping lanes increased chances of detection. The slatted design minimized bailing needs, as water drained through gaps, though occasional manual removal was required in heavy swells. The Carley float was intended for short-term survival lasting hours to a few days until rescue, relying on prompt search efforts rather than extended provisions; however, in rare cases, such as Chinese sailor Poon Lim's ordeal after the sinking of SS Benlomond in 1942, survivors endured multi-day drifts—133 days in his instance—through , rainwater collection, and conserving energy. Crew coordination was essential for endurance; a designated leader, often the senior survivor, assigned rotating roles including lookout duties to scan for rescuers, oversight of ration distribution to prevent hoarding, and morale-boosting activities like shared stories or songs to combat despair during prolonged exposure. In one account from the sinking of in 1941, the officer in charge organized water sharing and stabilized the damaged float by tying on a mattress, demonstrating adaptive teamwork.

Effectiveness and Limitations

Advantages in Emergencies

The Carley float's design enabled rapid deployment in maritime emergencies, allowing it to be simply cast overboard without the need for inflation or complex launching mechanisms, unlike traditional rigid lifeboats that required davits and crew coordination. This relatively lightweight construction, with smaller models weighing around 165 pounds (75 kg), permitted launch times of mere seconds, providing critical immediate flotation for crew members during sudden sinkings. For instance, during the 1943 torpedoing of the HMCS Louisburg, which sank in under four minutes, survivors successfully deployed multiple floats to rescue 50 men from the waters of the off . Its self-righting capability and inherent stability proved vital in rough seas, as the float's oval ring of watertight ensured it remained buoyant regardless of orientation, even if capsized by waves. This feature minimized the risk of total loss in turbulent conditions, allowing survivors to cling to lifelines without fear of the device inverting permanently. Historical accounts from operations highlight this reliability, with floats maintaining flotation after being battered by heavy swells during extended drifts. The float's overload buoyancy capacity significantly enhanced survival rates by accommodating far more individuals than its rated limit, often supporting 50 to 100 percent additional personnel through external clinging to the surrounding ropes. A standard float rated for eight to twelve could sustain up to thirteen inside or forty-two total in dire circumstances, as demonstrated in the 1945 sinking of HMCS Guysborough, where six of forty-two crew members on an overcrowded unit survived nineteen hours amid U-boat attacks. Similarly, in the case of HMCS Esquimalt that same year, twenty-seven of the forty-three who reached the floats were rescued after over five hours in cold waters (approximately 3°C). Durability under combat and environmental stress underscored the float's effectiveness, with its robust copper tubing and compartmentalized structure withstanding gunfire, , and prolonged exposure. A notable example is a shrapnel-riddled Carley float from the 1941 , which drifted over 1,500 miles across the before washing ashore on in February 1942, carrying the body of a crewman and demonstrating sustained integrity despite battle damage and months adrift. Such resilience allowed floats to endure collisions and long-term immersion without failure. Low maintenance requirements further amplified its utility in emergencies, as the passive flotation system—relying on sealed air compartments and filling—eliminated the need for pumps, valves, or frequent servicing beyond semi-annual inspections of lashings and covers. This simplicity ensured readiness on warships without ongoing operational demands, enabling reliable performance in all weather conditions during deployments.

Criticisms and Post-War Developments

The Carley float offered no canopy or , leaving survivors fully to the and highly susceptible to in cold waters. During , particularly in 1945 Atlantic convoy operations, reports documented numerous deaths from exposure among those who reached the floats, with over 30,000 sailors perishing in the phase after abandoning ships due to inadequate . Additionally, the included no built-in provisions for or , forcing reliance on prompt external , with estimated limited to three to five days at most without such supplies. The floats also offered no from marine hazards like and had no propulsion, limiting mobility. Post-World War II evaluations, including the 1946 Talbot Report by the Royal Navy, severely criticized the Carley float's inadequacy for preventing hypothermia and exposure-related fatalities, highlighting its role in the high loss rates during the Battle of the Atlantic. These critiques spurred the development of improved survival gear, including self-inflating rafts with canopies and enclosed lifeboats introduced in the Royal Navy by the 1950s. The Carley float was gradually phased out, replaced by more advanced designs such as Mark V rafts and later SOLAS-compliant inflatable life rafts by the , though some merchant fleets continued using them into the 1970s. Modern assessments recognize the float's value in its mechanical simplicity and buoyancy for short-term flotation but deem it outdated for prolonged scenarios due to its vulnerabilities.

Cultural Impact

Depictions in Media

The Carley float appears in several films. In more recent cinema, the 2016 film USS Indianapolis: Men of Courage portrays survivors adrift on Carley floats in the South Pacific following the cruiser's torpedoing, emphasizing the device's role in prolonged exposure to harsh and shark attacks. In literature, the Carley float features prominently in survivor accounts of maritime disasters, such as Richard F. Newcomb's Abandon Ship!: The Saga of the U.S.S. , the Navy's Greatest Sea Disaster (1958), which details the sinking and the desperate clinging to floats amid and predation in the Pacific. Fictional narratives also utilize the device, as in Alistair MacLean's debut novel HMS Ulysses (1955), where it serves as a stark symbol of desperate escape during Arctic convoy operations, with crew members battling while paddling the exposed rafts away from a crippled cruiser. Documentaries on WWII sea survival frequently highlight the Carley float's drifts, including BBC productions like the WW2 People's War series, which recounts eyewitness spotting of a float packed with survivors during rescue operations, underscoring its visibility in open water. Similarly, History Channel specials on naval disasters, such as those covering convoy losses, reference the float's use in extended adrift scenarios, often using archival accounts to depict the psychological toll of its minimal shelter. In visual media, of Carley floats appears in disaster reenactments across various productions, accentuating the device's stark, exposed design—copper tubes wrapped in with no canopy—through dramatic sequences of men scrambling aboard amid sinking ships and rough seas. These clips, drawn from wartime newsreels, emphasize the float's and vulnerability in evoking the era's life-or-death struggles at sea.

Legacy and Preservation

The Carley float left a significant mark on safety practices, serving as a precursor to more advanced ring-shaped life-saving apparatus that informed updates to international standards, including those in the Safety of Life at Sea (SOLAS) conventions following the 1914 revisions. Despite its vulnerabilities to exposure and , the device is credited with saving countless lives during , particularly amid U-boat campaigns in the Atlantic where rapid deployment was critical for survival. For instance, in the 1945 sinking of HMCS by a , 27 members were rescued after clinging to Carley floats in frigid waters for over five hours. Similarly, following the torpedoing of the SS Cape by U-515 in 1943, survivors on Carley floats were among those picked up by rescue vessels, contributing to the overall tally of lives preserved in such emergencies. Surviving Carley floats are meticulously preserved as historical artifacts in several maritime museums, underscoring their role in naval history. The exhibits a Carley float recovered from in 1942, which carried the remains of Thomas Clark from the lost , highlighting its connection to one of Australia's greatest naval tragedies. At the CFB Esquimalt Naval and Military Museum in , a Carley float forms part of the display, alongside period rations and uniforms to illustrate wartime survival gear used by Canadian forces. The Australian War Memorial in houses a bullet-riddled example believed to originate from , recovered by HMAS just days after the cruiser's sinking on November 19, 1941; scientific analysis in 1993 confirmed its wartime damage from machine-gun and shellfire. These preserved floats also feature prominently in commemorations of maritime losses, symbolizing the resilience and peril faced by sailors. The Carley float at the Australian War Memorial serves as a poignant centerpiece in exhibits and annual remembrance events for the 645 crew members lost, representing the sole physical relic of the engagement with the German raider HSK Kormoran. Similarly, references to Carley floats appear in memorials like the Tasmanian Seafarers' Memorial, where they evoke the endurance of victims from sinkings such as in 1941, reinforcing their enduring legacy in honoring naval sacrifices. Modern replicas, often constructed using original materials like and for authenticity, support historical reenactments and training simulations to demonstrate deployment techniques from the era.

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