IMPROVEMENTS IN VENTILATION
Year: 1877

page_text: LETTERS PATENT to Charles Stephen Robinson and George Goldsmith, both of
Leicester, in the County of Leicester, for the Invention of "IMPROVEMENTS IN
VENTILATION."
Sealed the 14th May 1878, and dated the 19th November 1877.
PROVISIONAL SPECIFICATION left by the said Charles Stephen Robinson
and George Goldsmith at the Office of the Commissioners of Patents on the
19th November 1877.
CHARLES STEPHEN ROBINSON and GEORGE GOLDSMITH, both of Leicester, in the
County of Leicester. "IMPROVEMENTS IN VENTILATION."
The object of this Invention is to effect such an arrangement of flues and valves,
or openings, as will ensure the thorough ventilation of the apartments to which
they may be applied without causing excessive draught and its attendant
objections.
The Invention consists in forming in the chimney breast, or in connection there-
with, in addition to the ordinary smoke flue, a perpendicular or inclined fiue, to the
top of which is fixed an Arnott's or other suitable valve, or even an open grating, so
as to connect the flue with the top of the room. The bottom of this fluc enters the
smoke flue a little above or near the throat of the chimney.
The Invention embraces not only the formation of a ventilating flue within the
chimney breast, as before described, but also a pipe or pipes partly exterior thereto,
or any other means by which the upper part of the room is by 'a descending flue
brought into communication with the smoke flue.
The arrangement acts in this way:-The chimney flue being higher than the
ventilating flue, the air in it is more rarified than that in the lower part of the
room; this causes an upward current of air through the smoke flue, and a partial
vacuum is occasioned in the ventilating flue; consequently the beated air in the
upper part of the room flows into the ventilating flue, and. descends to its outlet,
when the foul air is carried up the chimney flue by the ordinary current. The

page_text: effect of a fire in the grate of the chimney flue is simply to increase the rapidity of
the currents in the right direction in both flues. By this arrangement there is
no possibility of either smoke or back draught coming through the ventilator into
the apartment.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Stephen Robinson and George Goldsmith in the Great Seal
Patent Office on the 16th May 1878.
CHARLES STEPHEN ROBINSON and GEORGE GOLDSMITH, both of Leicester, in the
County of Leicester. "IMPROVEMENTS IN VENTILATION."
The object of this Invention is to effect such an arrangement of flues and valves,
or openings, as will ensure the thorough ventilation of the apartments to which
they may be applied without causing excessive draught and its attendant
objections.
The Invention consists in forming in the chimney breast, or in connection there-
with, in addition to the ordinary smoke flue, a perpendicular or inclined flue, to the
top of which is fixed an Arnott's or other suitable valve, or even an open grating, so
as to connect the flue with the top of the room. The bottom of this flue enters the
smoke flue a little above or near the throat of the chimney.
The Invention embraces not only the formation of a ventilating flue within the
chimney breast, as before described, but also a pipe or pipes partly exterior thereto,
or any other means by which the upper part of the room is by a descending flue
brought into communication with the smoke flue.
In order that the foregoing may be more easily understood Drawings are attached
hereto, of which the following is a description:-
Fig. 1 is a front elevation of an ordinary fire-place and a chimney breast; Fig. 2
is a side elevation of the same, and section of the party or side wall; and Fig. 3 is a
plan of the chimney breast through A, B, Fig. 1.
In Fig. 1 C is the fire-place; D, the chimney breast; and E, the chimney or
smoke flue, shown in dotted lines; F is the ventilating flue, which enters the smoke
flue at G, and is marked also in dotted lines; H is the opening into the ventilating
flue, and may be fitted with a valve, grating, or ornamental perforated covering, if
necessary or desirable; I is the floor line of an upper room; J, the ceiling line;
and K, the cornice.
In Fig. 2 the opening H is shown in the side of the chimney breast, instead of in
front, as in Fig. 1.
Similar letters refer to the same parts in each of the Figures.
The arrangement acts in this way-The chimney flue being higher than the
ventilating flue, the air in it is more rarified than that in the lower part of the
room; this causes an upward current of air through the smoke flue, and a partial
vacuum is occasioned in the ventilating flue; consequently the heated air in the
upper part of the room flows into the ventilating flue at H, and descends to its
outlet G, when the foul air is carried up the chimney flue E by the ordinary current.

page_text: The effect of a fire in the grate of the chimney flue is simply to increase the rapidity
of the currents in the right direction in both flues. By this arrangement there is no
possibility of either smoke or back draught coming through the ventilator into the
apartment.
Having now described and particularly set forth the nature of this Invention, and
the manner in which the same is or may be used or carried into effect, we would
observe in conclusion that we do not confine or restrict ourselves to the precise
details or arrangements which we have described or referred to, as variations may
be made therefrom without deviating from the principles or main features of this
Invention, but what we consider to be novel and original and therefore claim as the
Invention secured to us by the herein-before in part recited Letters Patent is, the
construction of a ventilating flue in combination with the smoke flue formed in the
brickwork, or made of earthenware or metal pipes, and arranged as herein described
and as shown on the Drawings.
In witness whereof, we, the said Charles Stephen Robinson and George Gold-
smith, have hereunto set our hands and seals, this Ninth day of May, in
the year of our Lord One thousand eight hundred and seventy-eight.