Map Showing the Positions of a Radar Line

(Original Caption) The map shows the position of the DEW (Distant Early Warning) radar line which is being constructed by the United States at a cost of over $1 billion. The line will extend from Alaska to Newfoundland roughly along the 70th parallel, and well within the Arctic Circle. When the operation is completed, the line will serve as a ready alert to warn the United States should any enemy aircraft approach the territory. Dr. William Petrie, chief of the operational research group of the Defense Research Board, said the major cities of the United States could not expect more than 3 hours warning in case of an enemy attack because of the supersonic speed of today's bombers.