But little reference has been made to the si sistance that the! aeroplane has lent to railway] engineers in half explored and parti sloped countries. In the past, survey parties, especially in densely timbered countries, have had to select a route for a projected railway often in ignorance of the fact that a much more practicable cute lay to one side or the other of the one chosen. They were necessarily earth-bound, and their vision—in the actual and primary sense—was limited. In Central Australia an_ expedition of aeroplanes, equipped with special cameras, has been mapping a circle ith a radius of 250 miles. The true position of the Ehrenberg. Ranges, which had not been known to within 60 miles, wa eand plotted during that the expedition was Also a large salt lake was ed and charted. Invaluable dat for future railway construction provision of, collected. This expedition is. being! conducted by Mr, Donald Mackay, who is financing the whole scheme and has had no assistance from either the Commonwealth or the State Governments.
Text read from the printed page and cleaned; old type leaves the occasional error.