M. F. Rupert

light barrier n. 1	1930 M. F. Rupert Via the Hewitt Ray in Science Wonder Quarterly Spring 383/1 I looked back to see if any harm had come to the Hewitt Ray machine. The fifty women surrounding it were directing great beams of light in all directions, forming a light barrier, which I later learned was able to stop and deflect any destructive beam which might be directed towards the machine.