[New York, N.Y. : The Aerial Age Company, Inc.] · leaf 62
erations can therefore be carried on by vation post, while another balloon acts tion. After making their_ qualifying flights the same balloon. One of the observers more or less as a free-lance and keeps its here they are sent back to Omaha for intensive will be engaged on spotting for the allotted… … addition to this he is in direct communi- cation by telephone with a ground sta- 70
Aeronautics -- Periodicals
Internet Archive · University of Illinois Urbana-Champaign · Public domain (published before 1931). Free to use for anything.
