Essendon Area Control Centre - 1946
This photo, taken c.1946 in the Melbourne (Essendon) ACC, shows Control Officer Peter Allen making calculations on the Rodoniscope, a type of circular slide rule named after its inventor, Sydney Flight Checking Officer Norman Rodoni. The Rodoniscope was used to calculate the longitudinal separation of aircraft flying on the same air route. See below for a close-up view.
In the background Stan Sambell writes up the latest flight information on the Air Traffic Pattern Board.
The Rodoniscope and Air Traffic Pattern Board were replaced by flight progress strips and the flight progress board from 1948.
Behind this record of safety in civil Aviation is the story of the development of an aeradio service spreading over the length and breadth of the continent. Facilities operated by the Department of Civil Aviation include:- 57 Aeradio Communication Stations; 17 Radio Ranges [Lorenz beacons]; 51 radio beacons [NDBs and Markers]; 29 M/F D/F stations; 3 H/F D/F stations; five teletype stations; five flying boat bases.
Mascot (Sydney) and Essendon (Melbourne), Australias two biggest and busiest airports, each handle over 100 scheduled airliner movements each day besides hundreds of movements by light, non-radio-equipped aircraft."
Peter Allen later became Principal Training Officer at the DCA (ATC) Central Training College.