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DD or duplex drive tanks, nicknamed "Donald Duck tanks", [1] were a type of amphibious swimming tank developed by the British during the Second World War.The phrase is mostly used for the Duplex Drive variant of the M4 Sherman medium tank, that was used by the Western Allies during and after the Normandy Landings in June 1944.
A float switch is a type of level sensor, a device used to detect the level of liquid within a tank. The switch may be used to control a pump, as an indicator, an alarm, or to control other devices. One type of float switch uses a mercury switch inside a hinged float. Another common type is a float that raises a rod to actuate a microswitch.
Beaumont St. Louis and San Francisco Railroad Water Tank (1875, restored 2012), Beaumont, Kansas, US. Although the use of elevated water storage tanks has existed since ancient times in various forms, the modern use of water towers for pressurized public water systems developed during the mid-19th century, as steam-pumping became more common, and better pipes that could handle higher pressures ...
An emergency kit, disaster bag, bug-out bag (BOB), [4] [5] [6] also known as a 72-hour kit, [7] GOOD bag (get out of Dodge), [8] [9] personal emergency relocation kit (PERK), go-bag, survival backpack, or quick run bag (QRB) [10] [11] is a portable kit containing items that would help a person to survive for 72 hours [12] during an escape or ...
As the tank water level drops, the float descends and actuates the fill valve. Water is fed to the tank to replenish its supply, and a smaller flow is directed into the overflow tube to refill the bowl. Once the flapper valve closes, the water flow from the fill valve continues until the tank level again reaches the fill line.
In the Drownproofing survival technique, the subject floats in a relaxed, near-vertical posture, with the top of the head just above the surface. Using the arms or legs to exert a downward pressure, the subject raises himself sufficiently so that the mouth is above the surface and a breath is taken, before dropping back into the relaxed float.
Survival tools and supplies found in a mini survival kit are generally kept in a container that is small enough to fit into a pocket. Small confectionery tins are commonly used but regular tobacco boxes, specially purchased mini-survival kit tins, life capsules, [1] 35mm film canisters, [2] plastic bottles, tin cans, and boxes are also commonly used.
The tank is filled with 10 inches (25 cm) of water which contains enough dissolved Epsom salt to create a specific gravity of approximately 1.25–1.26, enabling a person to float freely with their face above the water. In order to reduce thermal sensations, the water in the float tank is maintained at approximately skin temperature, around 35 ...
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