walls were covered with a layer of cement to insure of tightness.

[Illustration: A CEMENT RESERVOIR.]

T is the inlet pipe, with a diameter of 0.08 m.

T' is the distributing pipe, and T" is the waste pipe.--_Annales des
Travaux Publics_.

* * * * *




MACHINE FOR GRINDING LITHOGRAPHIC INKS AND COLORS.


The grinding of the inks and colors that are employed in lithographing
is a long and delicate operation, which it has scarcely been possible
up to the present time to perform satisfactorily otherwise than by
hand, because of the perfect mixture that it is necessary to obtain in
the materials employed.

Per contra, this manual work, while it has the advantage of giving a
very homogeneous product, offers the inconvenience of taking a long
time and being costly. The Alauzet machine, shown in the accompanying
cut, is designed to perform this work mechanically.

[Illustration: ALAUZET'S MACHINE FOR GRINDING LITHOGRAPHIC INKS.]