IMPROVEMENTS IN VENTILATORS, FANS, AND BLOWING MACHINES.
Year: 1874

page_text: LETTERS PATENT to David Pemberton Morison, of the Town and
County of Newcastle-upon-Tyne, Civil and Mining Engineer, for
the Invention of "IMPROVEMENTS IN VENTILATORS, FANS, AND BLOWING
MACHINES.
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Scaled the 12th March 1875, and dated the 14th September 1874.
PROVISIONAL SPECIFICATION left by the said David Pemberton
Morison at the Office of the Commissioners of Patents, with his
Petition, on the 14th September 1874.
15
I, DAVID PEMBERTON MORISON, of the Town and County of Newcastle-
upon-Tyne, Civil and Mining Engineer, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN VENTILATORS, FANS, AND BLOWING
MACHINES," to be as follows:-
My Invention has reference to those ventilators, fans, and blowing
machines which are composed of a casing provided with one or more
inlets or outlets for air, in which casing blades are made to revolve so as
to draw in air at one part and discharge it at another part. And my

page_text: Invention consists in constructing and fitting the blades so that they
widen out towards their periphery and are slightly curved in a forward
direction, that is to say, in the direction of their rotation. I make the
inlet or inlets of the casing in which these fans rotate of funnel shape or
conical. The inlets may be on one or both sides of the fan; if on both
sides I introduce a disc to keep the opposite currents from interfering
with each other. This disc is situated in the middle of the fan,
and extends from the axle towards the periphery of the blades as
far as may be thought requisite, so that the one half of cach blade
may draw from one side, and the other half from the other side of the
casing. I also introduce a regulator in the outlet, worked by any
suitable means, in order to control the amount of air discharged at a
given pressure by the fan.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said David Pemberton Morison in the Great Seal
Patent Office on the 13th March 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DAVID
PEMBERTON MORISON, of Newcastle-upon-Tyne, Civil and Mining.
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria by Her
Letters Patent, bearing date the Fourteenth day of September, in the
year of our Lord One thousand eight hundred and seventy-four, in the
thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
sessors, give and grant unto me, the said David Pemberton Morison,
Her special licence, that I, the said David Pemberton Morison; my
executors, administrators, and assigns, or such others as I, the said
David Pemberton Morison, my 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 "IMPROVEMENTS IN VENTILATORS, FANS, AND
BLOWING MACHINES," upon the condition (amongst others) that I, the said
David Pemberton Morison, my executors or administrators, by an instru-

page_text: ment in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said Inven-
tion, 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 I, the said David Pemberton Morison, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, reference being had to the
accompanying Drawings, that is to say :-
My Invention has reference to those ventilators, fans, and blowing
machines which are composed of a casing provided with one or more
inlets or outlets for air, in which casing blades are made to revolve so as
to draw in air at or near the centre and discharge it at one or more
outlets at the periphery. And my Invention consists in constructing
and fitting the blades so that they widen out towards their periphery,
and they may also be slightly curved in a forward direction, that is to
say, in the direction of their rotation. I make the inlet or inlets of the
casing in which these fans rotate of funnel shape or conical. The inlets
be on one or both sides of the fan, if on both sides a disc may be
introduced to keep the opposite currents from interfering with each
other. This disc should be situated in the middle of the fan, and extend
from the axle towards the periphery of the blades as far as may be
thought requisite, so that the one half of each blade may draw from one
side, and the other half from the other side of the casing. I also
introduce a regulator or variable shutter in the outlet worked by any
suitable means in order to regulate the area of the outlet and thereby
control the amount of air discharged at a given pressure by the fan.
may
Figure 1 of the annexed Drawings is a side elevation, Figure 2 a
transverse section, and Figure 3 a plan of a ventilator, fan, or blowing
machine, constructed according to this Invention.
J
A, A, represents the casing; it is carried by a suitable frame B, B;
O, O, are the inlets, one at each side of the casing, and of funnel shape
or conical; D is the outlet, which is made of evasé form, that is to say,
it gradually increases in diameter from its inner to its outer end; E is
the fan shaft, mounted in suitable bearings F, and furnished with
driving pulleys G; H is a boss on the shaft, and I, I, are the fan blades,

page_text: which are fixed at their inner ends to the boss, and the number of which
is optional. It will be seen that these blades widen out towards their
periphery, as has been herein-before stated, and that they are slightly
curved in a forward direction. The boss H will to a great extent, if not
altogether, keep the currents from the two opposite inlets C, C, from
interfering with each other, but should it be thought insufficient a disc, as
indicated at K, and as herein-before mentioned, may be employed. Lis
the regulator or variable shutter by which the area of the outlet D may
be varied as required.
And having now described the nature of my said Invention, and in :
what manner the same is to be performed, I declare that I claim,-
First. Constructing ventilators, fans, and blowing machines, as
herein-before described, and represented in the accompanying Drawings.
Second. Constructing the blades of ventilators, fans, and blowing
machines so that they widen out towards their periphery, substantially
as herein-before described and represented in the accompanying
Drawings.
Third. Constructing the blades of ventilators, fans, and blowing
machines so that they widen out towards their periphery and are slightly
curved in a forward direction, substantially as herein-before described
and represented in the annexed Drawings.
Fourth. Constructing ventilators, fans, and blowing machines, such
as herein-before described, with funnel-shaped or conical inlets, sub-
stantially as herein-before described and represented in the annexed
Drawings.
In witness whereof, I, the said David Pemberton Morison, have
hereunto set my hand and seal, this Tenth day of March, One
thousand eight hundred and seventy-five.