......... 5 kilogrammes.
Water of condensation per hour........ 0.75 cubic meter.
These machines are employed not only for the manufacture of ice, but
also in breweries for cooling the air of the cellars and fermenting
rooms, or that of the vats themselves; in manufactories of chemical
products; in distilleries; in manufactories of aerated waters, etc.
They may also be used in the carrying of meats and other food products
across the ocean, and, in a word, in all industries in which it is
necessary to obtain artificial cold.
The power necessary to operate apparatus that produce 25 kilogrammes per
hour is about that of 3 horses.--_Annales Industrielles_.
* * * * *
CARBONIC ACID IN THE AIR.
[Footnote: An address before the Paris Academy.]
By M. DUMAS.
Of all the gases that the atmosphere contains, there is one which offers
a special interest, as well on account of the part ascribed to it in
the mutual interchange going on between the two organic kingdoms, as
on account of the relation that it has been observed to occupy between
earth, air, and water; this gas is carbonic acid.
Ever since the fact has been established that animals consume oxygen
and give out carbonic acid as the product of respiration, while plants
consume carbonic acid and give out oxygen, the question has often been
asked whether the quantity of carbonic acid contained in the air did not
represent a sort of sustaining reservoir which was being continually
drawn on by the plants and resupplied by animals, so that it has
doubtless remained unchanged owing to this double action.
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