A 1950s vintage Douglas DC-7 now configured as a fire bomber. Photographed at Coolidge Airport, AZ. This shot shows the small "Storm Window" between the front windscreen and the side window. These small window were very common on early, unpressurized aircraft for the purpose thier name implies. When operating in inclement weather where visibility out of the front windscreen was impaired by ice or rain you could open these small windows to see outside. They were positioned so that when opened the airstream would blow the rain, snow, sleet, etc past them and not into the flight deck. Well...that was the theory at any rate. We still use the term "Storm Window" on modern light airplanes, but the new windows really don't serve the same purpose.