Four Sided Triangle

Four Sided Triangle is a 1953 British sciencefiction film directed by Terence Fisher, adapted from a novel by William F. Temple. It starred Stephen Murray, Barbara Payton and James Hayter. It was produced by Hammer Film Productions at Bray Studios.

Dr. Harvey, a rural physician, breaks the fourth wall to relate an unusual occurrence that happened in his village. The bulk of the story is told in flashback.Bill and Robin are boyhood friends who compete for the affections of Lena, a beautiful girl about their own age. Lenas family moves away, and in adulthood the two men become scientists. They collaborate on the Reproducer, a machine that can exactly duplicate physical objects. ........

Source: Wikipedia