CERTAIN IMPROVEMENTS ON STEAM ENGINES
Year: 1827

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPH
MAGDSLAY, of Lambeth, in the County of Surrey, Esquire, send greeting.
WHEREAS His most Excellent Majesty King George the Fourth, by His
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the First day of August, in the eighth year of His reign, did, for
Himself, His heirs and successors, give and grant unto me, the said Joseph
Maudslay, His especial licence, full power, sole privilege and authority, that
I, the said Joseph Maudslay, my exors, admors, and assigns, or such others
as I, the said Joseph Maudslay, my exors, adñiors, and assigns, should at any
time agree with, and no others, from time to time and at all times during the
term of years therein expressed, should and lawfully might make, use, exercise,
and vend, within England, Wales, and the Town of Berwick-upon-Tweed, my
Invention of "CERTAIN IMPROVEMENTS ON STEAM ENGINES;" in which said
Letters Patent there is contained a proviso obliging me, the said Joseph
Maudslay, by an instrument in writing under my hand and seal, particularly
to describe and ascertain the nature of my said Invention, and in what manner
the same is to be performed, and to cause the same to be enrolled in His
Majesty's High Court of Chancery within four calendar months next and
immediately after the date of the said recited Letters Patent, as in and by the
same, reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Joseph Maudslay, do hereby declare that my said Invention is described
in the Drawings and explanations hereunto annexed.
1st. It consists in the general arrangements and advantages of which will
be a reduction in weight in the expence of materials and cost of workmanship,

page_text: and in the room or space the engines will occupy, compared with those that
are at present most approved of.
2nd. In the peculiar construction of the frames.
3rd. In the application of a D valve or slide to regulate the admission of
steam to the cylinder, and its exit to the condensor.
4th. In the application of an eccentric to work the slide.
5th. In the manner of conveying the steam from the gudgeon on the
cylinder to the upper and lower ends of the slide case.
6th. In the formation of the slide case and its situation with respect to
the cylinder, (the steam being conveyed from the cylinder to the condensor
through a gudgeon that forms part of the slide case, and on which the cylinder
vibrates.
The foregoing and following explanations, with the references to the Drawings,
is thought sufficiently explanatory. As the Patent is not demanded for an
entirely new engine, but for the greater part in the adaptation of such parts of
other engines which are well understood and in general use, but have not
hitherto been used in engines having vibrating cylinders from the difficulty of
their application, but which are as essential to them as to others, in order that
the most effect may be produced by any given consumption of fuel; but such
parts of the engines (as the frame) not common to engines now in use (from
its peculiar construction) possess great advantages over the engines that
are now used in boats, from the power not going through the sleepers, but
being confined to the frame which carries the cylinders as well as crank
shaft, as shewn in the Drawing marked D, and by the letter a, likewise in the
manner of conveying the steam round and to the top and bottom of the
cylinder, by which means the engine is supplied with steam by the D valve or
slide in the most economical as well as effective manner, as shewn by the
letters i, j, in the Drawing marked B; also in the manner in which the steam
is conveyed from the cylinder to the condensor, the communication between the
two being very immediate, as may be seen by reference to the letter c in the
Drawing marked B.
the cylinder, gudgeons, steam and eduction pipes, slide case, air pump, con-
denser, &c. C, a plan of do., shewing the frames, crank shafts, discharge
valves, &c. &c. D, side elevation of do., shewing the cylinder, slide case,
eccentric and rod frames, &c. &c. a, frame. b, cylinder. c, slide case and
gudgeon. d, air pump. e, condenser. f, slide. g, eccentric and rod. h, half

page_text: cross head. i, gudgeon and steam pipe or bolt. j, passage communicating
with slide and belt. k, piston. 1, cylinder lid. m, crank shaft.
In witness whereof, I, the said Joseph Maudslay, have hereunto set my
hand and seal, this Twenty-ninth day of November, in the year of
T
1
AND BE IT REMEMBERED, that on the Twenty-ninth day of November,
in the year of our Lord 1827, the aforesaid Joseph Maudslay came before our
said Lord the King in His Chancery, and acknowledged the Specification afore-
said, and all and every thing therein contained and specified, in form above
written. And also the Specification aforesaid was stamped according to the
tenor of the Statute made for that purpose.
Inrolled the First day of December, in the year of our Lord One thousand
eight hundred and twenty-seven.