This series entry starts with the narrator saying 'No more lost airplanes.' He then explains how the first practical airplane flight recorder sends signals back to a control center, where th... Read allThis series entry starts with the narrator saying 'No more lost airplanes.' He then explains how the first practical airplane flight recorder sends signals back to a control center, where the plane's position is plotted by lights on a large board. Other reports include the produc... Read allThis series entry starts with the narrator saying 'No more lost airplanes.' He then explains how the first practical airplane flight recorder sends signals back to a control center, where the plane's position is plotted by lights on a large board. Other reports include the production of dry ice from gas reserves near the Salton Sea, an early telephone answering machin... Read all