tration of Chemical
Liquids.--By GEORGE ANDERSON, of London.--An apparatus
and process especially adapted to the manufacture of sulphate of
ammonia.--The invention of Alex. Angus Croll described.--1
illustration. 9757

Barlow's Machine for Moulding Candles.--A new apparatus for
candle manufacture, fully described and illustrated.--5
illustrations. 9754

Temperature of Gas Distillation.--The mooted question discussed
by Mr. WM. FOULIS, the eminent gas engineer. 9756

The Largest Black Ash Furnace in the World.--Note of a recent
furnace for use in the Leblanc process of soda manufacture. 9756

* * * * *

IMPROVED OSCILLATING HYDRAULIC MOTOR.

The motor of MM. Schaltenbrand & Moller is adapted for use for
household purposes, where small power is required, as in driving
sewing machines.

Fig. 1 shows the motor with all its parts in side elevation, the
flywheel and head rest being in section. Fig. 2 is a side view, with
the air reservoir and distribution valve in section through the line
1-2. Figs. 3 and 4 represent the same apparatus, but without support,
as where it is to be used on the table of a sewing machine, with the
crank of the motor directly fastened to the flywheel of the sewing
machine. Fig. 5 is a plan or horizontal section at the level of the
line 3-4, and Fig. 6 is a section passing through the same line, but
only including the cylinder and axis of the distributing valve. Fig. 7
is a horizontal section of the button of the cock through the line 5-6
of Fig. 3. Finally, Fig. 8 shows in detail, plan, and elevation the
arrangement of the starting valve.

[Illustration: Figs. 1 through 8 IMPROVED OSCILLATING HYDRAULIC MOTOR.]

This little motor does not show any new principle. It uses the old
oscillating cylinder, but it embraces in its construction ingenious
details which render its application very simple and very easy,
especially, as we have already said, to sewing machines.

In the first place, the oscillating bronze cylinder, A, is cast in one
piece with the distribution cock, _a_, Fig. 3, and its seat, _b_, also
of bronze, is adjusted and fastened by means of the screw, _b_, to the
air reservoir, C', cast with its cistern, C, acting as foundation or
bed plate for the motor. This cistern is held ei