Year: 1888

page_text: Date of Application, 14th June, 1888
Complete Specification Left, 8th Mar., 1889
Complete Specification Accepted, 1st June, 1889
A communication from abroad by LOUIS EDOUARD GOURDAN-FROMENTEL, OI Gray,
in the Republic of France, Doctor of Medicine.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention to be as follows :—
The improved ventilating apparatus forming the object of the present invention are
adapted for creating a powerful air current such as that required in mines, for which
purpose a motor is preferably used. In carrying out the invention the ventilator for
creating a powerful draught has a large fixed tank preferably of circular form, the
bottom being provided with a large opening to which the end of a large pipe is
attached.
Inside this fixed tank is a large circular ring or cylinder, the internal diameter of
which is somewhat larger than that of the aforesaid pipe. This ring being concentric
with the fixed tank, the space left between it and the latter is utilized as a water reservoir,
the water level of which is indicated by means of an external glass tube or gauge
communicating with it.
A large inverted tank of a diameter less than that of the aforesaid fixed tank
enters the annular space and is supported by a vertical shaft and suitable angle pieces.
The lower end of this vertical shaft revolves in a foot step supported by a cross piece
or bridge fixed to the bottom of the fixed tank and diametrically across the aforesaid
large pipe.
The shaft is further held in a vertical position by means of a bracket through which
its upper end passes. Beyond this bracket, the shaft is provided with a pulley keyed
on it, and driven by a belt.
The top part of the inverted tank is provided with two or more external pipes of
large diameter, the length of which may be equal to its diameter. When the inverted

page_text: tank is rotated, air is exhausted from the large pipe adapted to the bottom of the fixed
tank, and can only escape through the external pipes just named, as the water in the
annular tank forms a kind of packing between the inverted chamber and the central
ring. The inverted tank is provided within the fixed tank with an annular hood or
inverted gutter, the purpose of which is to prevent the water from escaping from the
annular reservoir over the edges of fixed tank, as owing to the centrifugal force com-
municated to it by the rapid rotation of the inverted tank, the water might rise too
high in the annular reservoir.
The aforementioned external pipes instead of being cylindrical may be made
conical, taper or other suitable shape and their outer ends inclined at a certain angle
on their longitudinal axis, or they may be curved.
The apparatus can also be used for ventilating hospital wards, barracks, stables, ships,
and for increasing the draught of fire-places.
A T-shaped pipe, having its horizontal branches provided with internal conical
nozzles, can be used to replace the inverted tank, and in this case set into motion by a
motor, etcetera.
Dated this 13th day of June 1888
WM. P. THOMPSON & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION:
Improvements in or relating to Ventilating Apparatus.:.
A communication from abroad by LOUIS EDOUARD GOURDAN-FROMENTEL, of Gray,
in the Republic of France, Doctor of Medicine.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E. of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street Manchester both in
the County of Lancaster and 323 High Holborn in the County of Middlesex; Civil
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement :-
The improved ventilating apparatus forming the object of the present invention is
adapted for creating a powerful air current such as that required in mines, for which
purpose a motor is preferably used.
This ventilating apparatus is represented in Figure 1 in elevation and partly in
section.
It consists of a large fixed tank A A preferably of circular form, the bottom being
provided with a large opening to which the end of a large pipe B B is attached.
Inside this fixed tank is a large circular ring or cylinder CC; this ring being con-
centric with the fixed tank A, the space left between it and the latter is utilised as a
water reservoir, the level of which is indicated by means of an external glass tube or
gauge D communicating with it.
A large inverted tank E E enters the annular space and is supported by a vertical
shaft H H and suitable angle pieces F F. The lower end of this vertical shaft revolves
in a foot step J, resting on a cross piece or bridge I I.
The shaft is further held in a vertical position by means of a bracket K through
which its upper end passes. Beyond this bracket, the shaft is provided with a pulley P
keyed on it, and receiving a belt which is driven by a motor.
The top part of the inverted tank E is provided with two or more external pipes T T
When the
of large diameter, the length of which may be equal to its diameter.
inverted tank is rotated, air is forcibly exhausted (through centrifugal force and
reaction) from the large pipe B B adapted to the bottom of the fixed tank, and can
only escape through the external pipes T T. The air can pass in no other way to or
from the tank as the water in the annular space forms a kind of packing between the
inverted chamber and the central ring. The inverted tank E is provided, within the
fixed tank, with an annular hood or inverted gutter R R, the purpose of which is to
prevent the water from escaping from the annular reservoir over the edges of fixed
tank A, as, owing to the centrifugal force communicated to it by the rapid rotation of
the inverted tank, the water might rise too high in the annular reservoir. Devices
may be added to maintain the water level within a certain limit.

page_text: The aforementioned external pipes T T, fitted to the tank, instead of being cylindrical,
may be made conical or taper, as shown in Figure, which represents in elevation
a front view of the pipe, or of other suitable shape, and their outer ends inclined at a
certain angle on their longitudinal axis. These pipes inust rotate backwards in order
to produce suction. Or they may be curved as shown in Figure 4, which represents
a plan view of the pipe seen from above. In this case the pipes must necessarily
rotate in the opposite direction to the curvature in order to produce suction.
Branch pipes may be fitted on to the tank at T. A pipe of this kind is shown in
horizontal section in Figure 2. In Figure 1 it is supposed to have been detached
on the left hand side at the end of the projecting part T. If these pipes be provided
internally with a nozzle C in the shape of a truncated cone (c Figures 1 and 2) a
still more powerful suction is obtained. This nozzle must of course turn so that the
wider end of the truncated cone is always in front, so that the movement of the air
driven into the pipe, and that of the air drawn up by the ventilator will take place in
the direction marked by the arrows.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
.
An improved ventilator consisting essentially of a fixed tank through the bottom of
which the air pipe enters, a cylinder or ring placed round the opening of the said pipe
and around which water may be placed, and an inverted revolvable tank supported by
a vertical shaft having a pulley or its equivalent, the said tank carrying an annular
projection to prevent overflow of the said water, and having also one or more pipes
adapted to produce suction by their rotation, the outer ends of said pipes being
provided with auxiliary suction devices, if desired, substantially as described and
shown.
Dated this 7th d L 1000
WM. P. THOMPSON & Co.,
Agents for the Applicant.