vented a
new method for treating it dry and dividing it into two products, one
of which, with low ash content, is distinguished by its granular
nature, while the other contains a large proportion of ash and is of
the fineness of flour. The former of these two products is, on account
of its low ash content, useful for various purposes, and the latter
constitutes a fuel quite ready for use in coal dust firing. The method
is founded on the circumstances, hitherto lost sight of, that the
incombustible constituents of the "schlamm" chiefly consist of clay
which was formerly more or less dissolved in the wash water; and on
the mud being dried and subjected to a suitable mechanical process,
the clay falls into fine dust, while the coal particles, on the
contrary, retain their granular nature. The method is carried out by
drying the mud and a subsequent fine sifting, which effects a breaking
up of the lumps that occur in the dried "schlamm," and a separation
into the two products above named. The dust that falls through the
sieve has a high ash content, being in the nature of flour, while what
remains behind is granular and has a low ash content. It seems to us
that this game is hardly worth the candle.

* * * * *

ELECTRICAL NOTES.

ELECTRICITY AT the Paris Exposition.--Electricity will play a large
part at the Paris Exposition of 1900, says the Revue Technique. No
less than 15,000 h.p. will be used for lighting and 5,000 h.p. for
furnishing electric power to the various parts of the grounds. As far
as possible all the machinery exhibited will be shown at work and for
this purpose electric conductors will be laid down to all points on
the grounds. The boiler plant will be located at the end of the Champ
de Mars, and will occupy two spaces of 130 X 390 feet each, one being
devoted to French boilers and the other to those of foreign makers.
This plant will be in itself a very interesting exhibit. It is
proposed to provide a capacity for evaporating not less than 440,000
pounds of water per hour.

AN INTERESTING little plant in which the rise and fall of the tides
is used as motive power for the generation of electricity is described
in L'Electricien. Near Ploumanach, on the northern coast of France,
where the tides have a daily range of 39 feet, a small fish pond
separated from the sea by a dike is arranged with gates so that at
high tide the water flows in and fills it, the gates clos