Year: 1887

page_text: I THEODORE STERNÉ of 1 Boulevard St. Denis, Paris, France, Gentleman do hereby
declare the nature of this invention to be as follows:-
This invention consists in the combination or combined use for the purpose of
ventilating rooms or other buildings of two apparatus arranged as hereinafter described.
and forming respectively a fresh air supply apparatus and a foul or vitiated air
discharge apparatus. The two apparatus are identical except that the one is the
reverse of the other. The inlet apparatus can only act to admit fresh pure air while
the discharge apparatus can only act to allow of the escape of foul or vitiated air. The
two apparatus can be fitted in a window or in a wall of the room or in a pipe com-
municating with the chimney or in any other suitable position and in order to establish
equilibrium it is necessary that the quantity of vitiated air which escapes shall be
replaced by pure air and this is effected by the inlet apparatus through which air is
admitted from the outside. The discharge apparatus should be above the inlet apparatus
or both may be at the same height at the upper part of the room, and there may be
several of each apparatus.
The fresh air inlet apparatus is composed of a set of valves or flaps hung at their
The
upper ends in a metallic or other frame so as when acted upon to open inwards.
foul air discharge apparatus is composed of a corresponding set of valves or flaps
likewise hung at their upper ends in a similar frame but so as when acted upon to
open outwards. The action of these apparatus depends on the difference of the density

page_text: between the outer air and the air inside the room or building to be ventilated. The
internal air vitiated by the breathing and emanations of the persons in the room or
. building and by the heat becomes light, rises and escapes by the discharge apparatus
while an equal volume of fresh air enters by the inlet apparatus. The valves or flaps
may be made of mica, silk or other material that is sufficiently light and sensitive so
that a slight difference between the external and internal air may actuate them.
The apparatus may be of round, square polygonal or other form and may be con-
structed with or without protecting gratings and with or without a cover for regulating
or entirely preventing their action as may be required.
Dated this 10th day of January 1887
J. C. MEWBURN,
169, Fleet Street, London,
Agent.

page_text: I THEODORE STERNÉ, of 1 Boulevard St. Denis, Paris, France, Gentleman, 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:-
This invention consists in the combination or combined use for the purpose of
ventilating rooms or other buildings of two apparatus arranged as hereinafter described
and forming respectively a fresh air supply apparatus and a foul or vitiated air
discharge apparatus. The two apparatus are identical except that the one is the
reverse of the other. The inlet apparatus can only act to admit fresh pure air while the
discharge apparatus can only act to allow of the escape of foul or vitiated air. The two
apparatus can be fitted in a window or in a wall of the room or in a pipe com-
municating with the chimney or in any other suitable position and in order to
establish equilibrium it is necessary that the quantity of vitiated air which escapes
shall be replaced by pure air and this is effected by the inlet apparatus through which
air is admitted from the outside. The discharge apparatus should be above the inlet
apparatus or both may be at the same height at the upper part of the room, and there
may be several of each apparatus.
In the annexed drawings Figure 1 is a transverse section of the fresh air inlet
apparatus and Figure 2 a transverse section of the foul air discharge apparatus.
Figure 3 is a face view representing either of the apparatus.
The fresh air inlet apparatus is composed of a set of valves or flaps m hung at their
upper ends in a metallic, glass or other frame so as when acted upon to open inwards.
The foul air discharge apparatus is composed of a corresponding set of valves or flaps m
likewise hung at their upper ends in a similar frame but so as when acted upon to open
outwards. The action of these apparatus depends on the difference of the density
between the outer air and the air inside the room or building to be ventilated. The
internal air vitiated by the breathing and emanations of the persons in the room or
building and by the heat becomes light, rises and escapes by the discharge apparatus
while an equal volume of fresh air enters by the inlet apparatus. The valves or flaps may
be made of mica, silk or other material that is sufficiently light and sensitive so that a
slight difference between the external and internal air may actuate them.
The apparatus may be of round, square, polygonal or other form and may be constructed
with or without protecting gratings and with or without a cover for regulating or
entirely preventing their action as may be required.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
As means or apparatus for ventilating rooms or buildings, the combination
of a fresh air inlet apparatus composed of valves or flaps which can only
open inwards with a foul or vitiated air discharge apparatus composed of valves or
flaps which can only open outwards, said inlet apparatus and said discharge apparatus
being identical with each other in construction except that the one is the reverse of
the other, substantially as set forth.
J. C. MEWBURN,
169, Fleet Street, London,
Agent.