Robert Noyce, Deseret Morning News Steel tubes — or mortars — are used to launch fireworks. The tubes are the same diameter as the shell and three times as long. The firework must fit snugly to enable gases to build up and launch the shell.
Mortars are usually lined up in racks filled with sand. Tubes are buried three quarters of their length into the sand.
Fireworks are fired electronically. Complex displays require fuses be hooked to a computer, which fires shells in sequence.
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