"That is precisely what they have done," answered Barbican referring to
his memorandum book; "the heat emitted by the Sun," he continued, "is
exactly that which would be produced by the combustion of a layer of
coal enveloping the Sun's surface, like an atmosphere, 17 miles in
thickness."
"Well done! and such heat would be capable of--?"
"Of melting in an hour a stratum of ice 2400 feet thick, or, according
to another calculation, of raising a globe of ice-cold water, 3 times
the size of our Earth, to the boiling point in an hour."
"Why not calculate the exact fraction of a second it would take to cook
a couple of eggs?" laughed Ardan. "I should as soon believe in one
calculation as in the other.--But--by the by--why does not such extreme
heat cook us all up like so many beefsteaks?"
"For two very good and sufficient reasons," answered Barbican. "In the
first place, the terrestrial atmosphere absorbs the 4/10 of the solar
heat. In the second, the quantity of solar heat intercepted by the Earth
is only about the two billionth part of all that is radiated."
"How fortunate to have such a handy thing as an atmosphere around us,"
cried the Frenchman; "it not only enables us to breathe, but it actually
keeps us from sizzling up like griskins.
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