Introduction This article we'll be looking at the construction of mortar racks from which to fire artillery shells during the show, and some techniques for using various fuses to attach devices together for the display. Mortar Racks Mortars are the tubes with plugged ends that fireworks shells, comets or mines are fired from. Mortars can be made of HDPE plastic, fiberglass, paper, or in some special cases, metal. The mortars need to be secured in an upright and safe position. This can be done by burying the mortars (guns) about 2/3 of their length in the ground. Here are a...