Balloon "Robot" Radios Weather Reports. This is the newest device to be used by the U.S. Weather Bureau in exploring the stratosphere, and it sends down radio reports of temperature and atmospheric pressure as it rises. A photo electric cell translates thermometer and barometer readings into radio signals. The photograph was made in Washington, D.C.

Viewing image 1 of 2
  • image 1
  • image 2

Item Information