Developed rivalrously among countries like Germany, the UK and the US in the 1930s, it was the primary means of defence against enemy craft approaching from the air and sea--spaces whose inordinate size and stealthy cover by darkness, cloud or fog represented a major blind spot for territori...
A machine and method for balancing across the brain's fusion bridge rivalrous stimuli of image pairs having diametrically opposed brightness and means of adjusting the rivalrous balance to measure the depth of a vision defect.Albert John Hofeldt...