Cutaway drawing of the <a href="https://en.wikipedia.org/wiki/MK_115_cannon" class="extiw" title="en:MK 115 cannon">en:MK 115 cannon</a>.
Sgt. Marie Mamone or Sgt. C. Jane Mcredith (the two illustrators credited in the book's Acknowledgements)
George Chinn 1951, The Machine Gun: Development During World War II and Korean Conflict by the United States and their Allies of Full Automatic Machine Gun Systems and High Rate of Fire Power Driven Cannon, Volume III, Parts VIII and IX., p. 637, US Government Printing Office