The Magnet was a British weekly boys' story paper published by Amalgamated Press. It ran from 1908 to 1940, publishing a total of 1,683 issues.
Magnet Number 1, 1908
A story paper is a periodical publication similar to a literary magazine, but featuring illustrations and text stories, and aimed towards children and teenagers. Also known in Britain as "boys' weeklies", story papers were phenomenally popular before the outbreak of the Second World War.
The Boy's Own Paper, front page, 11 April 1891