... observation balloons of WW1 (Allied and Central Powers)!
These columns could cover:
--- the types of used balloons (incl. further developments of the types)
--- tech. data (drawings, lifting capacities, etc.)
--- the used motor winches (engine manufacturer, carriage, lorries, etc.)
--- communication and camera equiment
--- preparing a balloon for a mission (ot dismantling it afterwards)
--- different methods how to direct artillery
--- anti-aircraft weapons used for protecting the balloon
--- organsiation of a balloon unit (equipment, personel) and chain of command
--- numbers and losses of the various balloon units
--- tactics (height, how close to the frontline, weather conditions)
--- other things (repairing balloons, balloon sheds, replacements)
It seems that this could cover more than just one column.
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__________________
Best regards from Germany
Volker Nemsch
"My words came out fine. The problem is that they were incorrectly processed by your brain."
(???)
"Much to learn, you still have."
(Yoda)
"I never said all that shit!"
(Confucius)