Chris Henry's interest in artillery developed whilst he was a volunteer worker at the Tower of London; he has since been Senior Curator at the Royal Armouries Museum of Artillery at Fort Nelson. Formerly the Head of Collections at Firepower!, the Museum of the Royal Artillery, he is now Curator of Explosion!, the Museum of Naval Firepower at Priddy’s Hard, Hampshire.Brian Delf is a freelance illustrator working on a variety of subjects including natural history and architecture. His work has been published in over 30 countries. Brian lives and works in Oxfordshire.