Mr. Matthews - a famous inventor - demonstrates his invisible beam that detonates explosives.
Title: "WAR'S LATEST TERROR! Mr. H. Grindell Matthews - the famous inventor - demonstrates his new discovery. An invisible beam that will detonate explosives".
C/U of Mr. M. standing outside his house. M/S of Mr. M. tipping some powder from a tin onto a crate in front of a brick wall, he stands back, there is a small explosion.
Intertitle: " ... or stop a motor engine".
C/U of a strange looking contraption consisting of a pendulum and a fan - a model of a motor engine? What looks like a beam from a torch shines onto the contraption, as the beam hits the fan it stops moving, when the beam is removed it starts, the same happens with the swinging pendulum as the light hits it.