CERTAIN IM- PROVEMENTS IN THE CONSTRUCTION OF STEAM ENGINES
Year: 1807

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
MAUDSLAY, of Margaret Street, Cavendish Square, in the County of Middle-
sex, Engineer, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Thirteenth day of
June, in the forty-seventh year of His reign, give and grant unto me, the
said Henry Maudslay, my exors, adññiors, and assigns, His especial licence,
full power, sole privilege and authority, that I, the said Henry Maudslay,
iny exors, adñiors, and assigns, during the term of years therein mentioned,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and the Town of Berwick-upon-Tweed, my Invention of "CERTAIN IM-
PROVEMENTS IN THE CONSTRUCTION OF STEAM ENGINES;" in which said Letters
Patent there is contained a proviso, obliging me, the said Henry Maudslay,
by an instrument in writing under my hand and scal, to cause a particular
description of the nature of my said Invention, and in what manner the same
is to be performed, to be inrolled in His Majesty's High Court of Chancery
within one calendar month after the date of the said recited Letters Patent,
as in and by the same, relation being thereunto had, may more fully and at
large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Henry Maudslay, do hereby declare that my said improvements consist in
reducing the number of parts in the common steam engine, and so arranging
and connecting them as to render it more compact and portable, every part
thereof being fixed to and supported by a strong frame of cast iron or other

page_text: materials perfectly detached from the walls of the building in which it stands,
and thereby less expensive in fixing, and not liable to get out of order by the
sinking of foundations, &c. The different arrangements and combinations I
adopt are fully described by Drawings of a one-horse steam engine hereunto
annexed, the same proportions being observed in engines of any power.
Observe, the same letters refer to the same parts in cach Figure throughout
the Drawings.
Fig. 1 and 2 represent a front and end elevation. Fig. 3, a plan. Fig. 4
and 5 are a sectional elevation and plan, showing those parts which are
unavoidably concealed in the foregoing Figures. Fig. 6 and 7 are certain
parts on an enlarged scale for the sake of illustration. A is the frame work
of thin cast iron; B, are two cold water cisterns of cast iron, no larger than
to admit of casy access to the pumps, &c. therein contained, and communicate
with cach other by a pipo (a); C is the steam cylinder inclosed in a casing
of copper or other materials (6) having the intermediate space filled with
wool or some other bad conductor of heat; D, the piston rod; E, the side
rods; F, a small groved wheel running between two guides (c, c,) to preserve
the perpendicular motion of the side rods; G, the connecting rods; H, a
three-throw'd crank; I, a small wheel or roller which works in the fork
of, and gives motion to the cross beam J, to which are attached the rods of
the air, hot and cold water pumps; K, the fly whcel fixed on the crank shaft;
L, the condencer containing the air pump M, simplified in its construction
by forming the valves d, e, f, of round metal plates; the two latter havo holes
at their centre e, for the pump rod to pass through, and for the stuffing box;
N, the hot water cistern; O, the hot water pump; P, the cold water pump;
Q, the injection cock adjusted at the index g, while the index h adjusts the
steam cock by cranks, levers, rods, &c.; R, the steam pipe from the boiler
to the cylinder; S, the eduction pipe from the cylinder to the condenser;
T, a four-way'd cock for making the alternate communications from the
boiler to the upper and under side of the piston to the condenser, and is
moved by an upright arm V, fixed on the cross beam J, the motions of which
are described in Figures 6 and 7, when the pin (i) works in the crutch W,
so formed as not only to move the cock at proper intervals, but almost
instantaneously leaving it motionless during the remainder of the stroke.
In witness whereof, I, the said Henry Maudslay, have hereunto set
my hand and seal, the Thirteenth day of July, in the year of our
Lord One thousand eight hundred and seven.
HENRY MAUDSLAY. (L.S.)

page_text: AND BE IT REMEMBERED, that on the Thirteenth day of July, in the
year of our Lord 1807, the aforesaid Henry 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 stampt according to the
tenor of the Statute made for that purpose.
Inrolled the Thirteenth day of July. in the rear of our Lord One
Inrolled the Thirteenth day of July. in the year of our Lord One
thousand eight hundred and seven.