IMPROVEMENTS IN THE 'GIFFARD' INJECTOR
Year: 1873

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane,
in the County of Middlesex, Patent Agent, for the Invention
of "IMPROVEMENTS IN THE 'GIFFARD' INJECTOR."-A. communication
from abroad by Raphaël Colacicchi, of Paris, France.
Sealed the 31st October 1873, and dated the 6th May 1873.
PROVISIONAL SPECIFICATION left by the said Alexander Melville
Clark at the Office of the Commissioners of Patents, with his
Petition, on the 6th May 1873.
I, ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County
of Middlesex, Patent Agent, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE 'GIFFARD' INJECTOR," to be as
follows:-
This Invention relates to improvements in the Giffard injector, and
consists more particularly in a mode of adjusting the same in one
motion, instead of by several, as heretofore necessary.

page_text: This single movement being progressive and in the same direction,
the most inexperienced person may at all times readily adjust the
apparatus.
In the apparatus illustrated in longitudinal section in the accom-
panying Drawing all the parts are fixed, with the exception of the 5
steam cone R and works between the central cone spindle A fixed to the
steam pipe T and the combining cone C.
The steam passes through a number of holes at a, a¹. The steam cone
or regulator R may be operated in various ways. A simple and sure
method consists in the employment of a screw M working in a nut or 1
half nut formed on the steam cone R, the latter being adjusted by means
of a hand wheel on the screw M.
The steam is taken direct from the boiler to the apparatus, and hemp
packings are almost entirely dispensed with.
The Invention
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Melville Clark in the Great Seal Patent
Office on the 5th November 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Alexander 2
Melville Clark, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of May, in the year of our
Lord One thousand eight hundred and seventy-three, in the thirty-sixth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Alexander Melville Clark, Her special licence
that I, the said Alexander Melville Clark, my executors, administrators,
and assigns, or such others as I, the said Alexander Melville Clark,
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

page_text: and Ireland, the Channel Islands, and Isle of Man, an Invention for "IM-
PROVEMENTS IN THE 'GIFFARD' INJECTOR," a communication to me from abroad
by Raphaël Colacicchi, of Paris, France, upon the condition (amongst
others) that I, the said Alexander Melville Clark, 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 Alexander Melville Clark, 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 Sheet of Drawings
hereunto annexed, and to the letters and figures marked thereon (that is
to say):
:-
This Invention relates to improvements in the "Giffard" injector,
and consists more particularly in a mode of adjusting the same to its
proper working position, in one instead of by several movements as
heretofore.
This single movement being progressive in the same direction the
most inexperienced person may at all times readily adjust the injector.
In the apparatus illustrated in longitudinal section in the accom-
panying Drawing all the parts are fixed, with the exception of the steam
cone R, which works between the cone spindle or plug A. (fixed to the
steam pipe T) and the combining cone c.
The steam passes through a number of holes at a, a, at the point
where the conical spindle or plug A is attached to the steam pipe.
The steam cone or regulator R may be operated in various ways. A
simple and sure method consists in the employment of an endless
screw M. working in a nut or half nut formed on the steam cone R,
which is adjusted by means of a hand wheel on the screw M.
With an injector constructed in the simple manner above described,-
1st. The steam passes direct from the boiler to the apparatus:
And, 2ndly. Hemp packings are almost entirely dispensed with.

page_text: Having described the nature of the Invention, and the manner in
which the same is to be performed, I declare that what I claim as the
Invention to be protected by the herein-before in part recited Letters
Patent is, an injector having a fixed cone spindle or plug, and a means
of adjustment by the movement of a single one of its parts, substantially
as herein shown and described.
In witness whereof, I, the said Alexander Melville Clark, have here-
unto set my hand and seal, this Fifth day of November, in the
year of our Lord One thousand eight hundred and seventy-
three.