IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1862

page_text: LETTERS PATENT to James Shand, of 245, Blackfriars Road, in the
County of Surrey, Engineer, and Samuel Mason, of the same Place,
Engineer, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
STEAM BOILERS."
Sealed the 5th December 1862, and dated the 11th June 1862.
PROVISIONAL SPECIFICATION left by the said James Shand and Samuel
Mason at the Office of the Commissioners of Patents, with their
Petition, on the 11th June 1862.
We, JAMES SHAND, of 245, Blackfriars Road, in the County of Surrey,
Engineer, and SAMUEL MASON, of the same Place, Engineer, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN THE CONSTRUCTION
OF STEAM BOILERS," to be as follows:-
This Invention relates to improvements in the construction of boilers or
steam generators (applicable to steam fire-engines or other purposes), such as
described in the Specification of a Patent granted to us, dated April 11th 1861,
No. 889, wherein an external and internal cone is employed, the latter forming
the fire-box and chimney. We have found, in practice, that the upper
part of the internal cone, which passes through the steam space, is liable to
be over-heated, and the object of our present improvements is so to modify the
upper part of the internal cone or chimney, that the over-heating may be

page_text: avoided, the extreme heat being transmitted to the water as it is supplied to
the boiler. For this purpose we prefer to contract the internal cone or fire-
box below the water line of the boiler, (and above the horizontal annular tube,
through which the hind axle passes, when the boiler is intended for a portable
steam or fire-engine), so that the upper or contracted part of the internal fire-
box forms a parallel tube, or nearly so. The contracted part of the chimney
of the fire-box is surrounded by a casing, which forms an annular space,
ascending near to the top of the boiler; into this space the feed-water is
forced, and when full it flows over into the boiler; if desired, another
annular casing may be employed, fixed to the top of the boiler, to conduct the
feed-water as it flows over, down to, or below the water line. A similar
arrangement may be employed with regard to the boiler, formed with an
internal cone before alluded to, for the purpose of protecting it by a feed-
water space, as above described.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Shand and Samuel Mason in the Great Seal Patent
Office on the 11th December 1862.
TO. ALL TO WHOM THESE PRESENTS SHALL COME, we, JAMES
SHAND, of 245, Blackfriars Road, in the County of Surrey, Engineer, and
SAMUEL MASON, of the same Place, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of June, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-fifth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
us, the said James Shand and Samuel Mason, Her special licence, that
we, the said James Shand and Samuel Mason, our executors, adminis-
trators, and assigns, or such others as we, the said James Shand and
Samuel Mason, our 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
THE CONSTRUCTION OF STEAM BOILERS," upon the condition (amongst others)
that we, the said James Shand and Samuel Mason, our executors or
administrators, by an instrument in writing under our or their hands and
seals, or under the hand and seal of one of us or them, should particularly

page_text: 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 we, the said James Shand and Samuel Mason,
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 thereof, that is to say :- .:
This Invention relates to improvements in the construction of boilers or
steam generators (applicable to steam fire-engines or other purposes), such
as described in the Specification of a Patent granted to us, dated April 11th,
1861, No. 889, wherein an external and internal cone is employed, the latter
forming the fire-box and chimney. We have found, in practice, that the
upper part of the internal cone, which passes through the steam space, is
liable to be over-heated, and the object of our present improvements is so to
modify the upper part of the internal cone or chimney, that the over-heating
may be avoided, the extreme heat being transmitted to the water as it is
supplied to the boiler. For this purpose we prefer to contract the internal
cone or fire-box below the water line of the boiler, and above the horizontal
annular tube, through which the hind axle passes (when the boiler is intended
for a portable steam or fire engine), so that the upper or contracted part of
the internal fire-box forms a parallel tube, or nearly so.
The contracted part
of the chimney of the fire-box is surrounded by a casing, which forms an
annular space ascending near to the top of the boiler; into this space the
feed-water is forced, and when full it flows over into the boiler. If desired,
another annular casing may be employed, fixed to the top of the boiler, to
conduct the feed-water as it flows over, down to, or below the water line. A
similar arrangement may be employed with regard to the boiler, formed with
an internal cone before alluded to, for the purpose of protecting it by a
feed-water space, as above described.
And in order that our Invention may be most fully understood and readily
carried into practice, we will proceed to describe the Drawing hereunto
annexed, which shews a vertical section of a steam boiler (suitable for a
portable steam or fire engine), constructed according to our present
improvements.
a is the internal cone or fire-box, which is contracted at the part a' below
the water line, the contracted part forming a parallel tube, or nearly so, from
this point to the top of the external cone b, where it is connected to the
chimney. The internal cone a is surrounded by a tubular casing c, which

page_text: forms an annular space around it, which terminates near to the top of the
boiler, and into this space the feed-water is forced, and when full flows over
.into the boiler, being, by preference, conducted below the water line by the
casing d, as shown. We would remark, that the form of the internal cone a
may be varied without departing from our Invention, and that our improve-
.ments are equally applicable to other forms of boilers, in which the vertical
tubes thereof are not entirely below the water line.
In witness whereof, we, the said James Shand and Samuel Mason have
hereunto set our hands and seals; this Eleventh day of December, in
the year of our Lord One thousand eight hundred and sixty-two..
:Witness,.
WILLIAM S. HEDGMAN, Clerk.
(L.S.)
JAMES SHAND.
SAMUEL MASON. (L.S.)
75, Upper Ground St., Blackfriars Road.