IMPROVEMENTS IN APPARATUS FOR EXHAUSTING OR FORGING AIR AND GASES.”
Year: 1874

page_text: LETTERS PATENT to James Dodge, of Eccles, near the City of Man-
chester, Engineer, for the Invention of "IMPROVEMENTS IN APPARATUS
FOR EXHAUSTING OR FORGING AIR AND GASES.”
PROVISIONAL SPECIFICATION left by the said James Dodge at the
Office of the Commissioners of Patents, with his Petition, on the
6th November 1874.
I, JAMES DODGE, of Eccles, near the City of Manchester, Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
Apparatus for EXHAUSTING OR FORCING AIR AND GASES," to be as follows:-
-
This apparatus consists of a vessel divided into two parts by a mid-
feather. Surrounding this vessel is a second vessel with a space between
the two containing water or other liquid. In this space an inverted
vessel is moved to and fro or up and down by steam or other power. In.
the top of the vessel first mentioned are two or more valves opening
internally and externally, and placed on each side of the midfeather, there
are also ingress and egress ports in connection therewith.

page_text: When the inverted vessel is put in motion the air or gas is drawn in
through the ingress port, passing through the internal and external
valves, and thence to the egress port.
It is desirable to place an overflow pipe near the top of the second
vessel, connected to a reservoir placed at such an elevation that the 5
liquid will return if displaced.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Dodge in the Great Seal Patent Office on
the 6th May 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES 1
DODGE, of Eccles, near the City of Manchester, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of November, 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- 1
cessors, give and grant unto me, the said James Dodge, Her special
licence, that I, the said James Dodge, my executors, administrators,
and assigns, or such others as I, the said James Dodge, 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
APPARATUS FOR EXHAUSTING OR FORCING AIR AND GASES," upon the condition
(amongst others) that I, the said James Dodge, my executors or admi- ¦
nistrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the
nature of the said Invention, 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 James Dodge, do hereby declare

page_text: I wish to remark here that these vessels may be worked in any other
convenient manner.
In the right-hand compartment of each vessel e is a set of valves
opening outwards, and in the left-hand compartment are the valves m
opening inwards. The space between the two vessels e and g is in com- 5
munication with the cistern or reservoir n by the overflow passages g¹,
and this cistern or reservoir is placed at such an elevation that the liquid
forming the lute will return to the space between the vessels e and g if
displaced.
When the machine is at work the inverted vessels & rise and fall in 1
succession, so that a constant and uniform current of air or gas may be
exhausted into and forced through the apparatus. Each vessel h in
rising becomes filled with the air or gas to be exhausted, which enters
the passage c, passes through the right-hand compartment of the vessel e,
and opens the valves 7, but as soon as the vessel h begins to descend the 1
valves / close instantly, and the air or gas that was in the vessel / opens
the valves m, passes down the left-hand compartment of the vessel e into
the egress passage d.
When the apparatus is used to force currents of air or gas for blast
engines or other purposes, valves opening inwards may be placed in the 2
top of the vessel h, and the air would then be forced through the
valves m into the air receiver e, and no midfeather would be required.
When the apparatus is used for exhausting only the valves are
retained, and valves opening outwards are placed in the top of the
vessel h.
Having thus stated the nature of my Invention and described the
manner of performing the same, I wish to remark that I do not limit
myself to the shape or size of the apparatus nor to the other details
given, as the same may be varied or modified.
I claim,―
3

page_text: Secondly. The use of two or more apparatus, as described, for forcing
air or gases into a common receiver or flue:
And, Thirdly. The apparatus described for exhausting air or gas.
In witness whereof, I, the said James Dodge, have hereto set
my hand and seal, this Third day of May One thousand eight
hundred and seventy-five.