Boys' and Girls' March of Comics #402

Hahn's

Elmer's uncle, Fignewton Fudd, has invented a sound trap that will capture sound in a jug. Later Elmer tries his uncle's time machine and Daffy tags along as they go back to England at the time of Hadrian's Wall. There, they uncover a plot by barbarians to foul a new Roman system of communication along the guard towers of Hadrian’s Wall.