IMPROVEMENTS IN APPARATUS USED IN THE MANUFACTURE OF GAS
Year: 1867

page_text: LETTERS PATENT to Henry Thomas Everist, of the Gas Works, Kidder-
minster, in the County of Worcester, for the Invention of "IMPROVEMENTS
IN APPARATUS USED IN THE MANUFACTURE OF GAS."
PROVISIONAL SPECIFICATION left by the said Henry Thomas Everist
at the Office of the Commissioners of Patents, with his Petition, on the
13th August 1867.
HENRY THOMAS EVERIST, of the Gas Works, Kidderminster, in the
County of Worcester, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS USED IN THE MANUFACTURE OF GAS," to be as
follows:-
These improvements relate to the construction of exhauster governors or
regulators whereby a more uniform pressure may be maintained in the retorts
when manufacturing gas, whatever quantity is being produced, than by the use
of the exhauster without the interposition of such apparatus. It consists of a
circular metal tank. or covered case having an orifice in the centre of the
bottom plate through which rises to somewhat less than half its height a pipe
which is connected to the outlet of the exhauster; in the top plate of the

page_text: case an orifice is also cast, and over this is affixed a pipe in connection
with the inlet of the exhauster. Within the case and over the pipe first
mentioned a metallic bell or gas holder shaped vessel is suspended by
working through a stuffing box in the cover, and attached to a chain which
passes over a wheel on the outside of the case. The chain terminates in a
rod whereon counterbalance weights are hung. In the sides of the bell
two, three, or more graduated angular apertures are formed; these openings
- may be made either in the plain sides of the bell or in recesses constructed
in it specially for the more easy passage of the gas. The bell is also provided
with guide rollers to preserve it in proper position when in use.
The action of the apparatus is as follows:-The case or tank being filled with
water or other suitable liquid up to a short distance below the top of the pipe
which rises within it the graduated apertures in the bell become sealed, and all
connection between the inlet and outlet of exhauster is closed. If a vacuum
is formed in the inlet main of the exhauster a like vacuum is also produced
in the upper part of the case, the bell consequently rises and discloses in pro-
portion to the vacuum a larger or smaller area of the angular openings, and
thus establishes, a communication between the inlet and outlet mains of the
exhauster corresponding in extent with that necessary to ensure uniformity of
pressure or vacuum, as the case may be.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Thomas Everist in the Great Seal Patent Office on
the 18th February 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
THOMAS EVERIST, of the Gas Works, Kidderminster, in the County of Worcester,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirteenth day of August, in the year. of our
Lord One thousand eight hundred and sixty-seven, in the thirty-first year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Henry Thomas Everist, Her special licence, that I, the said
Henry Thomas Everist, my executors, administrators, and assigns, or such
others as I, the said Henry Thomas Everist, 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

page_text: 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 USED IN THE MANUFACTURE OF GAS," upon the
condition (amongst others) that I, the said Henry Thomas Everist, my
executors or administrators, 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 Henry Thomas Everist, 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, reference being had to the accompanying Drawing, and
to the letters marked thereon, that is to say:-
These improvements relate to the construction of exhauster governors or
regulators whereby a more uniform pressure may be maintained in the retorts
when,manufacturing gas, whatever.quantity is being produce, than by the use
of the exbauster without the interposition of such apparatus. It consists of a
circular metal tank or covered case having an orifice in the centre of the
bottom plate, through which rises to somewhat less than half its height a pipe
which is connected to the outlet of the exhauster; in the top plate of the case
an, orifice is also cast, and over this is affixed a pipe in connection with the
inlet of the exhauster. Within the case and over the pipe first mentioned a
metallic bell or gas holder shaped vessel is suspended by a rod working through
& stuffing box in the cover, and attached to a chain which passes over a wheel
on the outside of the case. The chain terminates in a rod whereon counter-
balance weights are hung. In the sides of the bell two, three, or more
graduated angular apertures are formed; these openings may be made either
in the plain sides of the bell or in recesses constructed in it specially for the
more easy passage. of the gas. The bell is also provided with guide rollers to
preserve it in proper position when in use.
In order that the same may be more perfectly understood Drawings are
attached hereto of which the following is a description.
Fig., is an elevation parts of which are shown in section for the purpose of
disclosing the interual construction of the apparatus; Fig. 2 is a view of the
bell, or gasholder in plan, and Fig. 3 is an elevation of the bell or gas holder
showing the angular openings before alluded to. The like letters. of reference,

page_text: although inserted in different Figures, represent the same parts of the
apparatus.
A is the tank; B, the bell or gas holder; C, the stand pipe connected
to D or main in communication with the outlet of the exhauster; and E, E,
the pipe attached to the inlet of the exhauster; F is a rod fixed to the gas
holder, and works through a stuffing box in the top plate of the tank; G is a
wire, rope, cord, or chain attached to the top of the rod just spoken of and
passes over the wheel H, which is supported by a standard I. The other
extremity of the rope, cord, or chain is fastened to a rod whereon are hung
counterbalance weights sufficient to give the desired pressure. J, J, J, J, are
guide rollers affixed to the gas bolder to ensure steadiness in its action; K, K,
Fig. 2, show the recesses in the side of gas holder; and L exhibits the angular
openings therein. Although only two recesses and openings are shown, the
number may be increased to three or more.
The action of the apparatus is as follows:-The case or tank A being filled
with water or other suitable liquid to within a short distance of the top of the
pipe C which rises from the bottom plate, the graduated apertures in the
gas holder, shown at L, Fig. 3 become sealed, and all connection between the
inlet and outlet of the exhauster is closed. If however a vacuum
is
formed in the inlet main of the exhauster a like vacuum is also produced
in the upper part of the case or tank; the bell B consequently rises and
discloses in proportion to the vacuum a larger or smaller area of the
angular openings L, and thus establishes a communication between the
inlet and outlet mains of the exhauster corresponding in extent with that
necessary to ensure uniformity of pressure or vacuum, as the case may be.
Although only one form of apparatus has been illustrated, many modifications
of this Invention may be made without impairing its action. For example,
the tank A and the bell B are by preference made cylindrical, but not
necessarily so; in lieu of the wheel H a beam may be used; the bell B may
be also furnished with an air vessel at the bottom in the same way that many
governors are now constructed, whereby the use of a wheel or beam is
dispensed with and two standards and a crosshead, through which the top
of the rod F can work are substituted, the necessary weights to produce the
requisite pressure being hung on to the said rod.
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, I
would observe in conclusion that I do not confine or restrict myself to the
precise details or arrangements which I have described or referred to, as

page_text: variations may be made therefrom without deviating from the principles or main
features of this Invention; but what I consider to be novel and original and
therefore claim as the Invention secured to me by the herein-before in part
recited Letters Patent is, the construction of gas exhauster governors,
substantially as herein described.
In witness whereof, I, the said Henry Thomas Everist, have hereunto
set my hand and seal, this Twelfth day of February, in the year of
our Lord One thousand eight hundred and sixty-eight.
In witness whereof, I, the said Henry Thomas Everist, have hereunto
set my hand and seal, this Twelfth day of February, in the year of
our Lord One thousand eight hundred and sixty-eight.
HENRY T. EVERIST. (L.S.)