“Mortram. Decorative Painter and Artist in Fireworks. Coats of Arms, Magnificent Temples, Triumphal Arches, Sea Fights, etc. Executed in Fire Works so as to Produce the most Beautiful Effect.”

—From London Tradesmen’s Cards of the XVIII Century; An Account of their Origin and Use by Ambrose Heal. First published in 1910, I found this as a Dover reprint from 1968.