Fot those of you that are interested the book I checked is excellent for
close up pictures of guns and mountings on all sorts of WWI aircraft.
Amazing detail - great for modellers. Lots of cockpit views of DH2s
and other early puhsers as well as many unusual gun mountings.
The title of the book is:
_Early_Aircraft_Armament_
_The_Aeroplane_and_the_Gun_up_to_1918
by: Harry Woodman
Pub: Smithsonian Press
ISBN: 0-87474-994-8
Published: 1989
Enjoy!
-Al