IMPROVEMENTS IN APPARATUS FOR VENTILATING CON- FINED SPACES, WHICH APPARATUS IS ALSO APPLICABLE FOR THE CURE OF SMOKY CHIMNEYS
Year: 1876

page_text: LETTERS PATENT to Henry Lacy, of Hebden Bridge, in the County of York,
for the Invention of "IMPROVEMENTS IN APPARATUS FOR VENTILATING CON-
FINED SPACES, WHICH APPARATUS IS ALSO APPLICABLE FOR THE CURE OF
SMOKY CHIMNEYS."
Scaled the 23rd May 1876, and dated the 30th March 1876.
PROVISIONAL SPECIFICATION left by the said Henry Lacy at the Office of
the Commissioners of Patents on the 30th March 1876.
"IMPROVEMENTS IN
HENRY LACY, of Hebden Bridge, in the County of York.
APPARATUS FOR VENTILATING CONFINED SPACES, WHICH APPARATUS IS ALSO
APPLICABLE FOR THE CURE OF SMOKY CHIMNEYS."
This Invention consists in applying to the upper end of a ventilating shaft or
chimney a certain apparatus, the action of which causes a keen updraught, thus
continually changing the air in the space beneath. This apparatus is hollow, and
of a shaped section, revolving freely on the top of the shaft or chimney on a
spindle running in oil, which is protected from soot and other impurities in any
convenient manner. One end of the upper or horizontal portion is made bell
mouthed, and within it is soldered or otherwise fixed a conical tube tapering inwards,
and extending past the vertical opening by some three or four inches. The bell
mouth of this conical tube is always kept turned towards the wind by means of a
vane, and as the wind rushes through it has a tendency to create a vacuum on the
principle of an injector, thus drawing the foul air or smoke from the vertical shaft
or chimney.
It will be evident that an apparatus of this sort will be most efficacious as a cure
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Lacy in the Great Seal Patent Office on the 29th September
1876.
"IMPROVEMENTS IN
HENRY LACY, of Hebden Bridge, in the County of York.
APPARATUS FOR VENTILATING CONFINED SPACES, WHICH APPARATUS IS ALSO
APPLICABLE TO THE CURE OF SMOKY CHIMNEYS."
This Invention consists in applying to the upper end of a ventilating shaft or
This Invention consists in applying to the upper end of a ventilating shaft or

page_text: chimney a certain apparatus, the action of which causes a keen updraught, thus
continually changing the air in the space beneath.
Such being the nature and object of iny said Invention I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect, and in order that the same may be clearly understood I
have hereunto annexed a Sheet of Drawings illustrative thereof, and have marked
the same with figures and letters of reference corresponding with those in the fol-
lowing explanation thereof:-
Fig. 1 is a front view, and Fig. 2 a vertical section of my improved ventilator.
This apparatus is hollow, and of a T shaped section, as shown at a, a*, revolving
freely on the top of the shaft or chimney b, b, on a spindle c, c, running in oil in a
tube d, d, which is protected from soot and other impurities, as shown, or in any
other convenient manner. One end of the upper or horizontal portion ax is made
bell mouthed (in the Drawing both ends are shown so), and within it is soldered or
otherwise fixed a conical tube e, e, tapering inwards, and extending past the centre
of the vertical opening by some three or four inches. The bell mouth of this conical
tube is always kept turned towards the wind by means of a vane ƒ, f, and as the
wind rushes through it has a tendency to create a vacuum on the principal of an
injector, thus drawing the foul air or smoke from the vertical shaft or chimney b, b.
It will be evident that an apparatus of this sort will be most efficacious as a cure
for smoky chimneys.
Having now described the nature and object of my said Invention, together
with the manner in which the same is to be or may be performed, I wish it to be
understood that I claim as my Invention, the improved construction of ventilator,
as herein-before described and illustrated by the Drawing annexed, and especially I
claim the adaptation of the principle of the "injector" for the above purposes, sub-
stantially as described.
In witness whereof, I, the said Henry Lacy, have hereunto set my hand and
scal, this Twenty-eighth day of September, in the year of our Lord One
thousand eight hundred and seventy-six.