Walt Sheldon

insectoid adj.	1950 'S. Walters' All You Do Is Tranz the Frammis! in Amazing Stories July 82/1 The third creature was hard, stiff, plated, and insectoid.
light barrier n. 2	1950 W. Sheldon Eyes are Watching in Amazing Stories July 103/2 The speed of light. Pluto and back. That was only the test. That was only a quick run and the light barrier would be crossed for only a few seconds during the trip.
tri-vid n.	1955 W. Sheldon Your Time Is Up in Worlds of If June 44/1 But this talk about—about dial phones. About armies. Why, you sound like one of those historical tri-vids about the twentieth century!