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A steel tongue drum can be made from an empty, often 20-lb (9-kg) propane tank. The tank is flipped over and the base is cut or knocked off. Seven to ten tongues are then cut radially into the bottom of the tank, forming the top of the instrument. A steel tongue drum can also be made from a new unused tank head.
It was designed in Germany in the 1930s for military use to hold 20 litres (4.4 imp gal; 5.3 US gal) of fuel. Three handles allow for two people carrying a full can or one person handling an empty can. The basic design is still in use today although construction is often of high density polyethylene.
As of December 2015, the propane retail cost was approximately $1.97 per gallon, [62] which meant filling a 500-gallon propane tank to 80% capacity costed $788, a 16.9% decrease or $160 less from November 2013. Similar regional differences in prices are present with the December 2015 EIA figure for the East Coast at $2.67 per gallon and the ...
Store propane tanks outside. Never assume a tank is empty as even a small amount of residual gas can create a potentially explosive atmosphere in a confined space.
Both bombs failed to detonate, so the two students opened fire anyway, killing 12 students and 1 teacher, and injuring 21 others before both committing suicide. Another 20-pound (9.1 kg) propane bomb was found south of the school, presumably as a diversionary device for the police. Other propane tanks were found in their cars, for use as car bombs.
On 23 December 1988, a tank truck carrying propane on the Interstate 40 in Memphis, Tennessee, skidded from a ramp and rolled over. [3] [4] A small puncture released a vapour cloud that ignited in a boiling liquid expanding vapor explosion, creating a fireball 700 feet (210 m) in diameter. [5]