This photograph shows DCA Douglas DC3 VH-CAN engaged on calibrating the Runway 27 Instrument Landing System (ILS) at Melbourne's Tullamarine airport prior to the airport's opening. The terminal building can just be seen at the right of the photograph.

The surveyors in the foreground measure the aircraft's deviation from the desired flight path using the theodolite. The surveyor on the right is operating the theodolite, and the surveyor on the left is radioing the theodolite readings to another surveyor in the aircraft who records them on a chart recorder printout of the aircraft's flight path.

(Photo: CAHS collection)

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