IMPROVEMENTS IN CHIMNEY COWLS AND VENTILATORS
Year: 1879

page_text: LETTERS PATENT to John Marson Lamb, of 119, Finchley Road, South
Hampstead, Ironmonger, for the Invention of "IMPROVEMENTS IN CHIMNEY
COWLS AND VENTILATORS."
Sealed the 16th September 1879, and dated the 26th March 1879.
PROVISIONAL SPECIFICATION left by the said John Marson Lamb at the
Office of the Commissioners of Patents on the 26th March 1879.
JOHN MARSON LAMB, of 119, Finchley Road, South Hampstead, Ironmonger.
"IMPROVEMENTS IN CHIMNEY COWLS AND VENTILATORS."
1
This Invention consists of a metal cylinder open at both ends, the bottom end
fitting over a shaft of less diameter, the top end left open for exit of smoke or
vapour. On the outside of cylinder I fix semicircular cup shape pieces at equal
distances round the centre, on which the wind acts as the propelling power. Inside,
near the top of cylinder, I fix four or more arms radiating from centre, with square
hole through which it is supported on spindle. On these arms I fix four or more
sythe shape blades with the widest portion at top, and bent down to a convenient
angle for the discharge of smoke or vapour. The lower ends of these blades, which
are narrow, are fixed to lower part of cylinder, making an incline from the part that
rests on arms. The spindle on which the cylinder is supported I make hollow, with
solid steel point having holes drilled near the bottom; I also fix a grooved collar of
hard steel or other suitable material about one third from top. The top of spindle
is screwed to receive oil box cap, which has a square head on which the arms of
cylinder are placed, and secured by a screw cap which also covers up hole in
spindle. I make the oil box with a steel or other hard substance at bottom for
spindle point to work in & extend upwards to oil box cap under arms.
I also fix
a stout metal collar with three set screws at equal distances on the outside of oil
box to correspond with collar on spindle by which the spindle is kept in a perfect
upright position, and also prevent the cylinder from being lifted out of its place.

page_text: The oil box is supported at top of inner shaft with two or more stays; and it will
be seen that the lower portion of shaft or flue is perfectly free from all obstruction.
To fill the oil box it is only necessary to remove the top cap, pour in oil, when it
will flow into box through bottom holes of spindle, and it will be seen that both
axiss are working in oil. When the cylinder revolves by the action of wind the
blades cut the smoke or vapour, and expel it at top outlett. Now although the
cylinder is open at top no rain enters the shaft, it being caught by the blades and
driven out with centrifugal force between bottom of cylinder & shaft. By inaking
it with reversed blades in cylinder the action will be changed and a supply of air
driven downwards.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Marson Lamb in the Great Seal Patent Office on the 26th
September 1879.
JOHN MARSON LAMB, of 119, Finchley Road, South Hampstead, Ironmonger.
"IMPROVEMENTS IN CHIMNEY COWLS AND VENTILATORS."
This Invention consists of a metal cylinder open at both ends, the bottom end
fitting over a shaft of less diameter; the top end is left open for exit of smoke or
vapour. On the outside of cylinder I fix semi circular or cup shaped pieces at equal
distances round the centre, on which the wind acts as the propelling power. Inside,
near the top of cylinder, I fix four or more arms radiating from the centre, with
square hole through which it is supported on spindle. On these arms I fix four or
more scythe shape blades, with the widest portion at the top, and bent down at a
convenient angle for the discharge of smoke or vapour. The lower ends of these
blades, which are narrow, are fixed to lower part of the cylinder, making an incline
from the part that rests on the arms. The spindle on which the cylinder is sup-
ported I make hollow, with a solid point having holes near the bottom. I also fix
a grooved collar of hard steel or other suitable material about one third from the
top. The top of the spindle is screwed to receive the oil box cap, which has a
square head, on which the arms of cylinder are placed and secured by a screw cap,
which also covers up the hole in the spindle. Instead of fixing on a grooved collar,
same can be cast with the spindle; and, further, the oil box cover with the square
shoulder on which the arms of the cylinder are placed can also be cast with the
spindle in one piece. I make the oil box with a steel or other hard substance at
bottom for the spindle point to work in, and extend upwards to the oil box cap
under the arms. I also fix a stout metal collar with three or more set screws at
equal distances on the outside of oil box, or same can be cast with the oil box to
correspond with collar on spindle, by which the spindle is kept in a perfectly
upright position, also preventing the cylinder from being lifted out of its place.
The oil box is supported at the top of inner shaft with two or more stays, and it
will be seen that the lower portion of shaft or flue is perfectly free from all obstruc
tion. To fill the oil box it is only necessary to remove top cap and pour in oil,
when it will flow into the box through holes in the spindle, so that both axes are
working in oil. When the cylinder revolves by the action of the wind the blades
cut the smoke or vapour, and expel it at the top outlet. Now although the cylinder
open at top no rain enters the shaft, it being caught by the blades and driven
out by centrifugal force between bottom of cylinder and shaft; but it is obvious
that a hood or cover could be adopted, and hereinafter I have described an arrange-
ment thereof. By making it with reversed blades in cylinder; the action will be
changed, and a supply of air driven downwards.

page_text: .
is made hollow to admit oil, which is passed through same into box F by the
opening e at the top, and thence by opening e¹ at lower part of spindle into the box.
The spindle terminates in a point which works in a steel or other bearing f fixed at
the bottom of the oil box. The oil box on the outside is formed at G with a pro-
jecting ring, so as to form a seat on the ring H carrying the stays I, which are
secured to the chimney top. K, ring formed on or cast with the spindle E, against
which three or more set screws K' act. These screws are passed through the oil
box F (which at this portion is made thicker), and the screws acting against the
ring keep the cylinder A in a perpendicular position, and also prevent same being
lifted out of its place. L, oil box cover which I cast with the spindle, and which
fits over the top of oil box, and prevents dust and dirt entering the box; a slight
metal or other wrapper M being fixed round the box and the edge of the cover L.
The cover L may be made separate with the square head, and screwed onto the
spindle E N, top cap, which screws on to the spindle E, closing the top opening in
spindle for the admission of oil, and also holding the whole of the arrangements in
place. In Fig. 4 I show a covering over the top, which is divided underneath the
cover into the number of openings corresponding with those in the cylinder. This
cover is secured to the spindle by the nut before described, which is so made as to
screw on to the spindle E.
Having now particularly described and ascertained ¡the nature of the said Inven-
tion, and in what manner the same is to be performed or carried out in practice, I
hereby declare that I claim the Invention of "Improvements in Chimney Cowls and
Ventilators," consisting in the peculiar arrangement of cup shaped pieces, arms, and
blades, the whole working on a spindle in oil-box, substantially as herein before set
forth and described; though I do not limit myself to the precise details shewn by
the Drawings, and described by reference thereto, as same might be varied without
substantially affecting the character of my said Invention.
In witness whereof, I, the said John Marson Lamb, have hereunto set my
hand and seal, this Twenty-fifth day of September, in the year of our
Lord One thousand eight hundred and seventy-nine.
Witness,
T. MORGAN,
Secretary,
Inventors' Patent Right Ass., La.,
21, Cockspur Street,
Charing Cross, S.W.
J. M. LAMB. (L.S.)