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2. Fire pit - Wikipedia

   en.wikipedia.org/wiki/Fire_pit

   The Dakota fire pit is a tactical fire used by the United States military as the flame produces a low light signature, reduced smoke, and is easier to ignite under strong wind conditions. [ 2 ] This style of fire pit is said to get its name from the Dakota people , who used it while hunting bison herds on the Great Plains .

3. Swedish torch - Wikipedia

   en.wikipedia.org/wiki/Swedish_torch

   Swedish fire with sparks flying. A Swedish torch [a] is a source of heat and light from a vertically set tree trunk, incised and burning in the middle. It became known in Europe during the 1600s and is now used by forest workers, and for leisure activities (especially in southern Germany). Due to its flat surface and good embers, it can also be ...

4. Optical ring resonators - Wikipedia

   en.wikipedia.org/wiki/Optical_ring_resonators

   As subsequent loops around the first ring bring the light to the resonance condition of the second ring, the two rings will be coupled together and the light will be passed into the second ring. By the same method, the light will then eventually be transferred into the bus output waveguide. Therefore, in order to transmit light through a double ...

5. Ring flash - Wikipedia

   en.wikipedia.org/wiki/Ring_flash

   Closely related to the ring flash is the continuous ring light, which can produce a consistent level of light for video recording or to see a live preview before capturing photographs. Continuous ring lights are popular for improving picture quality on video calls, social media selfies, and video blogging. [ 1 ]

6. Fart lighting - Wikipedia

   en.wikipedia.org/wiki/Fart_lighting

   Lighting a fart. Fart lighting, also known as pyroflatulence or flatus ignition, is the practice of igniting the gases produced by flatulence.The resulting flame is often of a blue hue hence the act being known colloquially as a "blue angel", "blue dart" or in Australia, a "blue flame".

7. 3-ring release system - Wikipedia

   en.wikipedia.org/wiki/3-ring_release_system

   Front and side views of a 3-ring (mini rings) release system on a single riser of a packed main parachute. Since the introduction of the 3-ring system, variations in the design have raised safety concerns. For example, the move to mini rings and mini risers caused riser failures on some designs [6] until riser strength was improved.