GLOSSARY - J

jack -- a triangular brace hinged to a ground or other two dimensional set piece to suppor tit from behind
jackknife platform -- a platform that pivots on one corner
jog -- a narrow flat or piece of lumber attached at right angles to another flat to add a touch of variety and interest to the straight walls of a box set
jump tune -- show tune that is fast with a strong beat
juvenile -- role of a young man