"common problem that can cause burn back into the burner tube is too big of a gap where the gas comes out"
YES, exactly, you have it figured out.
"Miner's safety lamps" of old worked on the same principle.
The flame on one side of a screen or perforated metal tube couldn't pass through the small holes to light the flammable or explosive mixture on the other side.
The metal acts as a heat sink and keeps the heat of the flame on one side from passing through and lighting the "gas" on the other side.
"Sir Humphry Davy successfully tested his prototype safe lamp at Hebburn colliery, Tyne and Wear, in early January 1816.
Davy found that flame could not pass through the small apertures in fine gauze meaning the flame inside the gauze would not ignite the gas in the atmosphere outside the lamp. Davy was one of the most celebrated scientists of his day and his discovery, based on scientific principles, became the foundation for most flame-safety lamps that followed."
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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