Mine survey work that formerly took three or four months of labor with between 20 and 30 men now can be done in two to three hours with a helicopter. (...)

Original Toronto Star caption: Mine survey work that formerly took three or four months of labor with between 20 and 30 men now can be done in two to three hours with a helicopter. Hans Lunenberg; Toronto mining engineer; devised the procedure for making surveys from the cabin of the plane. He is shown here holding the wheel of the helicopter as it hovers motionless over his head.