AN IMPROVED MODE OF APPLYING THE COMPRESSION OF AIR FOR VENTILATING. PURPOSE, AND THE COMPRESSION OF ANY GAS FOR HURRYING ALONG ELASTIC FLUIDS IN CONVEYING PIPES
Year: 1865

page_text: LETTERS PATENT to Piarron de Mondésir, Engineer in the High Roads
Imperial Body, Paul Lehaitre, Civil Engineer, and Augustin Jullienne,
Engineer in Mechanics, all of No 60, Boulevart de Strasbourg, Paris,
in the Empire of France, for the Invention of "AN IMPROVED MODE
OF APPLYING THE COMPRESSION OF AIR FOR VENTILATING. PURPOSE, AND
THE COMPRESSION OF ANY GAS FOR HURRYING ALONG ELASTIC FLUIDS IN
CONVEYING PIPES."
Sealed the 1st June 1866, and dated the 8th December 1865.
PROVISIONAL SPECIFICATION left by the said Piarron de Mondésir,
Paul Lehaitre, and Augustin Jullienne at the Office of the Commis-
sioners of Patents, with their Petition, on the 8th December 1865.
We, PIAKRON DE MONDÉSIR, Engineer in the High Roads Imperial Body,
PALL LAHAITRE, Civil Engineer, and AUGUSTIN JULLIENNE, Engineer in
Mechanics, all of No. 60, Boulevait de Strasbourg, Paris, in the Empire of
France, do hereby declare the nature of the said Invention for "AN IMPROVED
MODE OF APPLYING THE COMPRESSION OF AIR FOR VENTILATING PURPOSE, AND THE
COMPRESSION OF ANY GAS FOR HURRYING ALONG ELASTIC FLUIDS IN CONVEYING
PIPES," to be as follows:-
...
.::
This Iuvention consists in compressing air with a forcing pump by any
[Price 8d.]

page_text: means in an air-tight chamber, and directing a small jet of that compressed
air into a pipe opening on ene side in the open air and on the other side in
any room, either workshop, dormitory, theatre, church, mining gallery,
water closet, or any other place where the air may be vitiated.
A very
small stream of the compressed air directed into the middle of the pipe
hurries or drives along the surrounding air as it rushes onward, which
produces an exhaust or sucking action behind. The effect can be
reversed, that is to say, the sucking or exhaust part of the pipe might
open in a smoky room, or a room filled with a deleterious gas or
vapour, whilst the opposite or blow-off side of the pipe should open in
the outside or open air. In a very short time the room will be emptied of
the hurtful fluid. This principle may be applied to any other gas, such as
lighting gas, to hurry or drive it along the conveying pipes.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Piarron de Moudésir, Paul Lehaitre, and Augustin
Jullienne, in the Great Seal Patent Office on the 7th June 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, PIARRON
DE MONDÉSIR, Engineer in the High Roads Imperial Body, PAUL. LKHAITRE,
Civil Engineer, and AUGUSTIN JULLIENNE, Engineer in Mechanics, all of
No. 60, Boulevart de Strasbourg, Paris, in the Empire of France, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighth day of December, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said Piarron de Mondésir, Paul Lehaitre, and Augustin Jullienne, Her
special licence that we, the said Piarron de Moudésir, Paul Lehaitre, and
Augustin Jullienne, our executors, administrators, and assigns, or such
others as we, the said Piarron de Mondésir, Paul Lehaitre, and Augustin
Jullienne, our executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "AN IMPROVED

page_text: MODE OF APPLYING THE COMPRESSION OF AIR FOR VENTILATING PURPOSE. AND THE
COMPRESSION OF ANY GAS FOR HURRYING ALONG ELASTIC FLUIDS IN CONVEYING
PIPES," upon the condition (amongst other ) that we, the said Piarron de
Mondésir, Paul Lehaitre, and Augustin Jullienne, our executors or adminis-
trators, by an instrument in writing under our, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that we, the said Piarion de Mondésir, Paul Lehaitre,
and Augustin Jullienne, do hereby declare the nature of our said Invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:―
d
P,
in which u is the
This Invention consists in applying for ventilating purpose the moving
force of compressed air darted or impelled through the centre of a conveying
pipe of a much larger size than the central stream of compressed air, and also
in applying a stream or jet of any compressed gas for hurrying or driving
along elastic fluids in conveying pipes by means of theapparatuses represented
on the annexed Sheet of Drawing forming part of this Specification, by
Figures 1, 2, 3, 4, which are sectional views drawn to a small scale. It will
of course be understood that the compressed air used is taken from a suitable
receiver in which it is previously produced by any kind of motive-power
engine working forcing pump or pumps. It has been ascertained by successful
experiments that the speed of the column of air set in motion in the con-
veying pipe is given by the following formula u=
speed of the moving stream or jet; d, the diameter of the outlet of the tube
through which the compressed air escapes; D, the diameter of the conveying
pipe; p, the number of atmospheres of pressure of the compressed air; A, a
co-efficient proceeding from the relation of the length to the diameter of the
conveying pipe; therefore by modifying either the pressure or the relation of
the diameter one may obtain in the conveying pipes currents of various
velocities. Further, it is evident that the apparatus may be applied either
for exhausting or sucking in, or for forcing out, as may be required, so that
it may be applied either to extract vitiated air, smoke, dust, or any deleterious
iniasmas, or to force pure atmospheric air from out of doors into any hall or
apartment. When the apparatus is used to ventilate or introduce fresh air
into a room the cold arising from the letting off ("détente") of the compressed

page_text: air is communicated to the bulk of air hurried along, and cools it. This
cooling effect may be increased at pleasure without greatly increasing the
rapidity of egress of the compressed air by merely lessening the diameter of
the suction pipe, as is shown by Figure 4 of the Drawing. The apparatus,
working with either an exhaust or sucking, or with a forcing action, may be
applied,―
Firstly, to the ventilation of hospitals, barracks, theaters, exhibitions,
dancing and music halls, or any large apartments.
Secondly, to the ventilation of mining galleries, tunnels in course of
perforation or digging, and to unhealthy works or workshops of: any kind.
Thirdly, to the ventilation of ships, either to supply the hold between
decks or cabins with air, or to rapidly carry off the smoke of powder from
the batteries of men-of-war.
Fourthly, to the purification of cesspools, sewer pits, or waterclosets pro-
viḍed with ventilating pipes, and for increasing the draught of chimneys or
fire-places by directing a jet or stream of compressed air in the said pipes,
chimneys, or funnels.
Fifthly, it may be applied to the blowing machines of furnaces by intro-
ducing into the wind pipe a small tube through which a jet of compressed
air or any combustible gas will issue or start out.
Sixthly, to hurry or drive along lighting gas in the conveying pipes by
means of a jet or stream of compressed gas, either to replace wholly or in
part the forcing power of gasometers or gasholders, or in lieu of theextracting
or compressing apparatuses in actual use to force the gas as it evolves from
the retorts through the purifying, washing, and other apparatuses used in
producing it.
Our Invention being now fully described, and also the means by which
it may be carried into effect, we wish to have it understood that we do not
confine ourselves to any particular arrangement of the apparatus above
described, the Drawing annexed being only to carry into the mind an idea
of its various modes of application, but what we claim as our Invention is
applying the compressed air,-
Firstly, to ventilation in general by bringing pure air into places where
many people are assembled or thickly tenanted.
Secondly, for purifying purposesor expelling smoke, dust, or any unhealthy
gas from similar places.
Thirdly, for increasing the draught of chimneys, and the blast (or com-
bustible) power of blowing machines.

page_text: Fourthly, for hurrying along lighting gas by compressed hydrogen as
previously described, related, and enumerated.
In witness whereof, we, the said Piarron de Mondésir, Paul Lehaitre, and
Augustin Jullienne, have hereunto set our hands and seals, this
Thirty-first day of May, in the year of our Lord One thousand eight
hundred and sixty-six.
10 Signed and sealed
in the presence of
L. D'AUBREVILLE, C.E.
PIARRON DE MONDÉSIR. (L.B.)
P. LEHAITRE.
A. JULLIENNE.
(L.S.)
(L.S.)