know how a rocket works, but how are Roman candles made?
is the traditional name for a firework that has been around for centuries.
In its simplest form, it's just a cardboard tube with a star sitting inside
it. The fuse runs into the tube and ignites a lifting charge, popping
the shell out of the open top and into the air where it explodes.
lifting charge is black powder which when ignited produces a lot of gas
pushing the bundle of stars upwards.
The best known Roman
candle is the air-bomb which has stars that explode with a loud bang when
they reach the right height.
Some Roman candles
have more than one shell inside, stacked on top of each other, separated
by a lifting charge. The fuse runs down the inside of the tube, igniting
each charge in turn. Thus the shells are launched one after the other,
with a pause between each one. This is known as a 'multi-shot' candle.
The effects can be varied depending on the types of shell inside the tube.