Today's picture shows Albert Leo Stevens after his balloon is aloft. Yesterday we saw him preparing for launch. In this picture we see the entire balloon, and we can tell that in fact the balloon is a gas balloon, not a hot air balloon. The picture was taken in 1911, so most likely the balloon was filled with Hydrogen. Hydrogen has greater lift than helium, but of course one must be concerned that Hydrogen is a highly explosive gtas.
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