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In 1932, at the invitation of the Smithsonian Institution, Douglass participated in a scientific expedition off Easter Island, where he filmed at depths up to 1,500 feet using his submarine cameras and also an underwater "flashlight" that he also patented. In the mid-1930s he participated in a classified US Navy operation filming the ocean ...
A few underwater lights have a focusing facility by which the beam angle can be adjusted. There are two ways this can be done, depending on the basic emission pattern of the light source. HID lights, which generally produce non-directional light, are usually focused by a reflector, which can be slid longitudinally over the light.
A magnesium torch is a bright light source made from magnesium, which can burn underwater and in all weather conditions. They are used for emergency illumination for railroad applications. They were also used in the 1950s up to the early 1970s as a light source for scuba diving, and were featured occasionally in television shows. A relay of ...
This small waterproof tool packs a bunch of life-saving essentials into it, including a 5000mAH power bank, an emergency radio with AM/FM/NOAA weather radio tuning, a flashlight, an SOS alarm.
Underwater writing slates and pencils are used to transport pre-dive plans underwater, to record facts while underwater and to aid communication with other divers. Dive lights , which are usually waterproof and pressure rated torches or flashlights , are essential for safety in low visibility or dark environments such as night diving and wreck ...
The timeline of underwater diving technology is a chronological list of notable events in the history of the development of underwater diving equipment.With the partial exception of breath-hold diving, the development of underwater diving capacity, scope, and popularity, has been closely linked to available technology, and the physiological constraints of the underwater environment.
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