an_old_friend wrote:

Had to be Hydrogen (or Hot air) The USA had the sole sources of
Comercail Helium and we would not seel it much abroad after all it was
clear airship were going to be vital in the next big war The result was
of Hidenburg burned because it used Hydrogen


Helium is a trace element in the atmosphere. It is recovered when
air is compressed to a liquid, and the individual gases are boiled off
into separate storage tanks. The US government had a strategic reserve
of helium for military use, but anyone with enough money was able to
produce usable quantities of it. Air Products in the US operates these
"Air reduction plants". They have one in Middletown Ohio. The liquid
oxygen is sold to AK Steel for their bessimer converters that make pig
iron and iron slag out of raw materials.

--
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Michael A. Terrell
Central Florida