Ship-Based Anti Submarine Defense Cutaway, 1950
Illustration by Ray Quigley shows an anti-sub device from 1950 termed “the hedgehog.”
It lobbed multiple depth charges all at once at the presumed submarine location. Charges were slightly angled so that they would land in a spreadout, scattershot pattern, covering a wider range.
Click to Enlarge to 695 x 768 px:
Source: Popular Science March 1950