IMPROVEMENTS IN FEED APPARATUS FOR STEAM BOILERS
Year: 1863

page_text: LETTERS PATENT to William Grindley Craig, of Cannon Street, in the
City of London, Engineer, for the Invention of "IMPROVEMENTS IN FEED
APPARATUS FOR STEAM BOILERS."-A communication from abroad by
Michel Turck, of Paris, France.
Sealed the 23rd October 1868, and dated the 1st May 1863.
PROVISIONAL SPECIFICATION left by the said William Grindley Craig
at the Office of the Commissioners of Patents, with his Petition, on the
1st May 1863.
I, WILLIAM GRINDLEY CRAIG, of Cannon Street, in the City of London,
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN FEED APPARATUS FOR STEAM BOILERS," to be as follows:-
This Invention consists of improvements hereafter set forth and illustrated
in the accompanying Drawings, upon a feed apparatus known as Giffard's
injector.
The improvements will bo best understood by referring to Figure 1 of the
accompanying Drawings, which is a longitudinal section of the apparatus.
A is a water regulator, free to be moved in the interior of the water chamber
C by rack and pinion H, or by any other equivalent mechanical arrangement.

page_text: It is separated from the steam supply funnel E by the space N; B is a
trumpet mouth, in which the steam funnel E terminates; it is opened and
closed by means of the spindle or valve G; C is the water chamber; D is a
tube, in which the suction takes place, and in which the water and steam
become mixed; E, passage leading steam from the boiler into the apparatus;
G' is the water inlet pipe. Figure 2 shews in longitudinal section the appa-
ratus modified to suit low-pressure steam.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Grindley Craig in the Great Seal Patent Office on
the 31st October 1863.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
GRINDLEY CRAIG, of Cannon Street, in the City of London, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the First day of May in the year of our Lord One
thousand eight hundred and sixty-three, in the twenty-sixth year of Her
reign, did, for Herself, Iler heirs and successors, give and grant unto me,
the said William Grindley Craig, Her special licence that I, the said William
Grindley Craig, my executors, administrators, and assigns, or such others as
I, the said William Grindley Craig, 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 "IM-
PROVEMENTS IN FEED APPARATUS FOR STEAM BOILERS," (communicated to me
from abroad by Michel Turck, of Paris, France,) upon the condition (amongst
others) that I, the said William Grindley Craig, my executors or adminis-
trators, 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 William Grindley Craig, 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

page_text: following statement thereof, reference being had to the Drawings hereunto
annexed, that is to say :-
This Invention consists of improvements hereafter set forth and illustrated
in the accompanying Drawings, upon a feed apparatus known as Giffard's
injector.
The improvements will be best understood by referring to Figure 1 of the
accompanying Drawings, which is a longitudinal section of the apparatus.
A is a water regulator, freo to be moved in the interior of the water
chamber C by rack and pinion II, or by any other equivalent mechanical
arrangement. It is separated from the steam supply funnel E by the space N ;
B is a trumpet mouth, in which the steam funnel E terminates; it is opened
and closed by means of the spindle or valve G ; C is the water chamber; D is
a tube, in which the suction takes place, and in which the water and steam
become mixed; E, passage leading steam from the boiler into the apparatus;
G' is the water inlet pipe. Figure 2 shews in longitudinal section the appa-
ratus modified to suit low-pressure steam; Figure 3 is a section through the
line a, b, of Figure 1; Figure 4 is a section through the line g, d, of Figure 1 ;
and Figure 5 is a view of the pinion, gland, and spring for working the rack II.
To put the injector to work, the regulator A must be drawn back to the
extent required by means of the rack and pinion H, or by other suitable
means. The water supply can then enter into the funnel D, where the steam
creates the suction, on drawing back the spindle G, thus opening the tuyere.
It will be seen that the piston, with its various parts and packing, is entirely
dispensed with in this Invention. It possesses the means of independently
regulating the water supply by the regulator, and the steam by the valve G,
and among other advantages these two parts or valves can work independently
of each other. The regulator A is arranged in such a manner as to isolate the
water chamber from the steam funnel E. The annular spaco N prevents
the contact of the water upon the hot steam pipe, and thereby prevents
the priming which is common with all other injectors, and which destroys tho
suction.
And having now described the nature of the said Invention, and in what
manner the same is to be performel, I declare that I claim as my improve-
ments in feed apparatus for steam boilers,―
First, the arrangement of the water regulator A working internally in a
water space, and outside of the steam pipe.
And, second, constructing them with a space or interval N for the purpose
of preventing contact with the water contained in or passing into the water

page_text: space C, with the steam pipe or funnel in which it terminates, as herein-before
described.
In witness whereof, I. the said William Grindley Craig, have hereunto
set my hand and scal, this Thirty-first day of October, One thousand
eight hundred and sixty-three.
WILLIAM GRINDLEY CRAIG. (L.S.)