ke.
Fig. 1 represents the apparatus complete, with gasometer and bottling
machine. Fig. 2 gives a vertical section of the apparatus properly so
called, including the producer, the purifier, and the saturator, all
grouped upon a cast-iron column.

[Illustration: FIG. 1. APPARATUS FOR MANUFACTURING GASEOUS BREEZES.]

The producer, A, is designed to receive the sulphuric acid and carbonate
of lime. A mixer, F, revolves in the interior of this, and effects an
intimate admixture of the lime and acid without the necessity of the
former being pulverized beforehand. The carbonate of lime (usually in
the form of chalk) is introduced directly into the producer through the
aperture, K, while the acid contained in the receptacle, B, at the side
of the column and above the producer flows put through a curved pipe in
the bottom. The flow is regulated by the valve, C. The receptacle, B, is
lined with platinum. As soon as the acid comes into contact with the
carbonate, there occurs a disengagement of carbonic acid gas, which
flows directly through the pipe, F, into the purifier at the upper part
of the column. From thence the gas passes into a third washer, D, of
glass. When thoroughly washed, it flows through the pipe, L, into the
gasometer, which is of galvanized iron, and is very carefully balanced.

The saturator, which is the most important part of the apparatus,
comprises a pump, a feed reservoir, and a sphere. The pump, which is of
bronze, is placed at the side of the column, at the lower part (Fig. 1).
This sucks up the gas stored in the gasometer and the water contained in
the reservoir, and forces them into the sphere. This latter is of
bronze, cast in a single piece, and the thickness of its sides prevents
all danger of explosion. It is silvered internally, and provided with a
powerful rotary agitator that favors the admixture of the water and gas.

[Illustration: FIG. 2.]

The apparatus it rendered complete by a bottling machine, which is
placed either on a line with the apparatus or in front of it. This
machine is connected directly with the sphere by a block-tin
pipe.--_Chronique Industrielle_.

* * * * *

APPARATUS FOR MEASURING THE FORCE OF EXPLOSIVES.

Among the numerous apparatus that have been devised for determining the
power of powder, those designed for military purposes are the ones most
extensively used. Up to the present, very few experimental apparatus
have been