Study of People
His study and interesting in mathematics was what fueled this project of his when he was only 19-years-old. The small spy camera was called the C.P. Stirn Concealed Vest Spy Camera. “It was a round flat canister hidden under the vest with the lens sticking out through a buttonhole,” he told St. Hallvard Journal in 1942. “Under my clothes, I had a string down through a hole in my trouser pocket, and when I pulled the string the camera took a photo.”