Men pump up large observation balloon in field and launch it.
Location of events unknown.
A giant egg-like thing is being carried toward camera by about ten RAF (?) guys. Side view as they carry it past. Back view they set it down on ground; next to its big brother - a giant balloon thing; held down w/ ropes. A bunch of guys around.
Shot of men holding a big fat tube up to hole in the giant balloon; pumping air into it; a soldier standing on stepladder to reach it. Pan left; on what must be more of the same giant balloon which is curved around like a worm; moving around and filling up. Airmen holding onto ropes as the thing rises.
Shot of the giant thing in the air; with a camera hanging from it to take surveillance photographs. Similar to airship / Zeppelin / blimp. But what was that first balloon for? (Could be pump? SL.)
Surveillance techniques. inventions; aviation; flight. World War One.