Photostory #36: 20th Century Prospectors Take to the Air
National Film Board of Canada
December 9, 1955
Canadian Museum of Contemporary Photography fonds, National Gallery of Canada Library and Archives
Mounted in a five-foot tube in tail of Canso flying boat, a magnetometer scanner is examined by electronics operator before rake-off. From impulses recorded on a zig-zag graph, geologists can determine areas rich in minerals; motion picture camera simultaneously records ground from which impulses were received.