IMPROVEMENTS IN INJECTORS FOR FEEDING STEAM GENERATORS
Year: 1869

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn
Fields, in the County of Middlesex, Gentleman, for the Invention
of "IMPROVEMENTS IN INJECTORS FOR FEEDING STEAM GENERATORS."—A.
communication from abroad by Henry Giffard, of Paris, in the
Empire of France.
Scaled the 26th November 1869, and dated the 23rd June 1869.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition, on
the 23rd June 1869.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County
of Middlesex, Gentleman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN INJECTORS FOR FEEDING STEAM GENERATORS,'
a communication from abroad by Henry Giffard, of Paris, in the Empire
of France, to be as follows:-
This Invention relates to certain improvements in the construction and
arrangement of what are known as feed water injectors for steam
generators, and has for its object the simplification of the same by

page_text: dispensing with the moveable steam joints and with the regulating of the
water under varying pressures, and consists essentially in so constructing
the injector that the nozzle's free space and diverting tube may be
instantly dismounted by means of an internal screwed collar or tubular
boss provided with a shoulder or otherwise formed, and fitting into the
main barrel of the apparatus. Through this collar is screwed an inner
tube, along which the feed water passes, and from which it escapes by
lateral openings to the branch pipe leading to the boiler. By this mode
of construction the apparatus can be readily examined and all the parts
cleaned when requisite. This facility of dismounting the parts permits
of the apparatus being instantly and at any moment, even whilst in
action, placed at the most convenient point for the admission of the water
according to the maximum normal pressure at which it is intended to
work, and this pressure may descend to a small fraction of its original
pressure without stopping the working of the apparatus. A small handle
may be maintained constantly fixed to the hinder part of the apparatus
for the purpose of operating at will the various adjustments, or the
apparatus may be withdrawn or closed hermetically by means of a
screwed or bolted cap.
In apparatus intended to be placed below the level of the supply
water the needle or conical plug may be dispensed with, and the working
is carried on by the steam cock.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Henry Johnson in the Great Seal Patent
Office on the 23rd December 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-third day of June, in the year of
our Lord One thousand eight hundred and sixty-nine, in the thirty-
third year of Her reign, did, for Herself, Her heirs and successors,
give and grant. unto me, tho said John Henry Johnson, Her special
license that I, the said John Henry Johnson, my executors, adminis
trators, and assigns, or such others as I, the said John Henry Johnson,

page_text: my executors, administrators, or assigns, should at any time agree
with, and no others, from time to time and 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 INJECTORS FOR FEEDING STEAM GENERATORS," a communi-
cation from abroad by Henry Giffard, of Paris, in the Empire of France,
upon the condition (amongst others) that I, the said John Henry Johnson,
my executors or administrators, by an instrument in writing under my
hand and scal, 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 John Henry Johnson, do hereby.
declare the nature of the 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.
Drawings, and to the letters and figures marked thereon, that is to
say:-
The said Invention relates to certain improvements in the construction
and arrangement of what are known as Giffard's feed water injectors for
steam generators, and has for its object the simplification of the same
by dispensing with all moveable steam joints and with the necessity for
regulating the water under varying pressures, and consists essentially in
so constructing the injector that the nozzle's free space and diverging
tube may be instantly disconnected by means of an internal screwed
collar or tubular boss provided with an external shoulder, or otherwise
formed, and fitting into the main barrel of the apparatus. Through this
collar is screwed an inner tube containing the diverging throat, along
which the feed water passes, and from which it escapes by lateral
openings to the branch pipe and through an intermediate valve leading
to the boiler. An internal screw thread is formed on the end of the
diverging throat, into which is screwed the converging throat, lateral
openings being made in the end of the diverging throat round the free
space which intervenes between the contiguous ends of the converging
and diverging throats. The conical steam nozzle is permanently fixed
by flanges which are bolted between the junction flanges of the outer or

page_text: main casing, and is more or less closed by the ordinary conical screwed
spindle. By this mode of construction the apparatus can be readily
examined and all the parts cleaned when requisite. This facility of dis-
connecting the parts permits also of the apparatus being instantly and at
any moment, even whilst in action, adjusted to the most convenient
point for the admission of the water according to the maximum normal
pressure at which it is intended to work, and this pressure may descend
to a small fraction of its original pressure without the apparatus ceasing to
work, A small haudle may be maintained constantly fixed to the hinder
part of the apparatus for the purpose of operating at will the various
adjustments, or it may be removed and the apparatus closed hermetically
by means of a cap screwed or bolted thereon.
In apparatus intended to be placed below the level of the water supply.
the conical screwed spindle may be dispensed with, and the regulation bo
carried on by the steam cock.
And in order that the said Invention may be fully understood I shall
now proceed more particularly to describe the same, and for that purpose
I shall refer to the accompanying Drawing, which represents a
longitudinal vertical section of my improved injector.
A is the internally screwed collar, which fits into the interior of the
outer casing of the injector, and is provided with an external shoulder
fitting against a corresponding shoulder formed inside the casing, and
thus holding the screwed collar A in position; B is the diverging throat,
provided with an external screw thread which screws into and through
the collar A, and is consequently capable of being adjusted longitudinally
in either direction, and of being easily introduced into and withdrawn
from the apparatus by simply turning the small handle C, shown in rod
lines, fitted on to the rear end of the part B. The converging throat
D is screwed at a, a, on to the end of the part B constituting the
diverging throat, lateral openings E, E, being made in the free space
between the end of the converging throat D and the entrance to the
diverging throat B. F is the conical nozzle which is permanently fixed
by means of flanges b, b, bolted between the flanges of the outer casing,
and is capable of being closed or partially closed by the adjustable
screwed conical spindle G. H, H, are lateral openings made in the
diverging throat B, through which the foed water escapes into the
branch pipe I containing the intermediate valve K leading to the boiler,

page_text: L is a cap for hermetically closing the end of the apparatus when the
handle C is removed.
Having now described and particularly ascertained the nature of the
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that 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,―
First. The application and use of the internal screwed collar A, in
which is screwed so as to be readily adjustable and easily withdrawn tho
pipe forming the diverging throat, substantially as and for the purposo
hercin-before described and illustrated by the Drawing.
Second. The screwing together of the diverging and converging
throats and the forming of lateral openings E, E, in the intervening
free space, substantially as and for the purposes herein-before described.
Third. The employment of a permanently fixed conical steam nozzlo
F, as and for the purposo horein-before described.
In witness, whereof, I, the said John Henry Johnson, have to this
my Specification set my hand and scal, the Twenty-second day
of December One thousand eight hundred and sixty-nine.
J. HENRY JOHNSON. (L.S.)