Show heavens discovered to glow with invisible ray fort davis texas dr otto joint director of the mount locke observatory in the davis mountains and the yerkes observatory of the university of chicago discovered that the midnight sky is lighted up with infrared infra red rays that dim the stars the only trouble is that the human eye cant see the in in fra red A new camera installed at the observatory atory here was responsible for the discovery the camera has a spherical mirror and a thin lens ot of ultraviolet ultra violet glass dr C T elvey and I 1 used this instrument for photographing the sky with infrared infra red plates sensitive to radiations intermediate between the reddest viable rays and the heat rays dr said we found to our surprise that the th night sky is cor bantly luminous in infrared infra red light so that if our eyes were sensitive to these radiation radi radiations atio rl s they would see the sky as a luminous surface upon which the stars would appear relatively pale |