and two men, and took a month. The brick lining was built up in eight
days by a mason and his assistant.

A chimney of the same size, all of brick, erected on the same
foundation, would have weighed 2,459,600 pounds (say a load of 3,070
pounds to the square inch), and would have cost about $2,860.

The chimney of the Rocourt distillery is, therefore, lighter by half,
and cost about a third more, than one of brick; but, at the present
price of metal, the difference would be slight.--_Annales
Industrielles._

* * * * *




THE PRODUCTION OF OXYGEN BY BRIN'S PROCESS.


Considerable interest has been aroused lately in scientific and
industrial circles by a report that separation of the oxygen and
nitrogen of the air was being effected on a large scale in London by a
process which promises to render the gases available for general
application in the arts. The cheap manufacture of the compounds of
nitrogen from the gas itself is still a dream of chemical enthusiasts;
and though the pure gas is now available, the methods of making its
compounds have yet to be devised. But the industrial processes which
already depend directly or indirectly on the chemical union of bodies
with atmospheric oxygen are innumerable.