Harl Vincent (October 19, 1893 - May 5, 1968) was the publication name of Harold Vincent Schoepflin, an American mechanical engineer and science fiction author. He was published regularly in science fiction "pulp" magazines. In this book: Vulcan's Workshop Creatures of Vibration The Copper-Clad World Wanderer of Infinity Old Crompton's Secret Silver Dome The Terror of Air-Level Six The Moon Weed Vagabonds of Space Gray Denim Terrors Unseen