NEW IMPROVED ENGINE OR MACHINE ON A ROTATIVE PRIN- CIPLE
Year: 1790

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, We, JOSEPH
BRAMAH, of Piccadilly, in the County of Middlesex, Engine Maker, and
THOMAS DICKINSON, of Bedworth Close, in the County of Warwick, Gentleman,
send greeting.
WHEREAS His most Excellent Majesty King George Third, by His
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Fifteenth day of January, in the thirtieth year of His reign, did
give and grant unto us, the said Joseph Bramah and Thomas Dickinson, His
special licence, full power, sole privilege and authority, that we, the said
Joseph Bramah and Thomas Dickinson, our executors, administrators, and
assigns, should and lawfully might, during the term of years therein expressed,
make, use, exercise, and vend, throughout that part of His Majestie's Kingdom
of Great Britain called England, the Dominion of Wales, and Town of Ber-
wick-upon-Tweed, our "NEW IMPROVED ENGINE OR MACHINE ON A ROTATIVE PRIN-
CIPLE;" in which said recited Letters Patent is contained a proviso obliging us,
the said Joseph Bramah and Thomas Dickinson, by writing under our hands
and seals, to cause a particular description of the nature of our said improved
engine or machine, and in what manner the same is to be performed, to be
inrolled in His Majestie's High Court of Chancery within one calendar month
next after the date of the said recited Letters Patent, as in and by the said
Letters Patent and the Statute in that behalf made, relation being thereunto
had, may more at large appear.

page_text: ""
NOW KNOW YE, that in compliance with the said proviso, and in pursu-
ance of the said Statute, we, the said Joseph Bramah and Thomas Dickinson,
do hereby declare, that our said Invention is composed and made in manner
following, that is to say:
This Invention having undergone a very copious description in a former
Patent, and being a machine calculated for a great variety of applications
which may from time to time render sundry non essentials variations in its
constructions necessary, we think it useless to repeat a formal exemplification
in words which would tend only to perplex rather than inform. The merits
of this machine depends on having two wheels or cylinders made of brass or
any other kind of metal or materials proper for the purpose. One of these
wheels or cylinders is of a greater and the other of a less diameter in any
required proportion; their lengths must be always nearly equal, but are subject
to any increase or decrease, in conformity to the purpose to which the machine
is applied. The larger of these wheels or cylinders being fixed, the smallest
one is placed within the larger, and is 'fixed' on an axis or pevets in such a
manner as to be capable of turning in a rotative or circulating direction round
it's centre: The said smaller wheel or cylinder being thus stationed, it may
occasionally be fixed, and the outer or larger wheel or cylinder may be turned
in the above direction round the smaller one; however, the former of these
has in all cases the preference. There is at each end of the larger wheel or
cylinder a flaunch, to which is scrued two plates or caps which incloses the
the ends thereof, and into which the ends of the smaller or inner wheel or
cylinder may be a little inserted, in order to render the junction nearly or
water tight. Through one or both of these plates or caps the axes or pevets
of the inner wheel or cylinder passes, in order that motion may be communi-
cated thereto from without, or the said inner wheel or cylinder being moved
on its axis or pevets by some power or force acting upon it from within the
said axis or pevett, may be applied so as by its external end or ends to give
motion to any other engine or machine thereunto applied. This being done,
the effects of this engine or machine is produced as follows:-The difference
in the two diameters of these said wheels or cylinders causes a circular channel
or grove to be formed between the extreme sphericall surface of the inner or
lesser wheel or cylinder and the inner surface of the larger one. In the said
channel or circular groove is performed all the operative effects of the machine,
and that by means of two or more, sliders, which may be stationed either in'
the inner wheel or cylinder or in the perefery of the outer one in such a
manner as by the motion of 'the machine the said sliders are successively
moved or projected into the channel or groove, so as to fit nearly or water-

page_text: proof, in order to act therein as a piston or fan either to sweep and empty the
said channel or groove of all its contents when turned round, or when a
current of water, steam, or other fluid having force is admitted into the said
channel or groove, and passing through it may by acting on the projected part
of the said sliders, cause the inner wheel or cylinder to be turned round its
centre or axis with a power equal to the cause, or primum mobile, i.e. the specific
gravity or the elastic force of the fluid. The Figures or Drawings hereunto
or hereunder annexed will more fully shew the the true nature of this our said
improved Invention.
In witness whereof, we have hereunto respectively set our hands and
seals, this Thirteenth day of February, in the year of our Lord One
thousand seven hundred and ninety.
Signed, sealed, and delivered by the
above-named Joseph Bramah and
Thomas Dickinson, in the presence of
JOSEPH BRAMAH. (L.B.)
THOS DICKINSON. (L.s.)
AND BE IT REMEMBERED, that on the Thirteenth day of February, in
the year of our Lord 1790, the aforesaid Joseph Bramah and Thomas Dickin-
son came before our said Lord the King, and acknowledged the Specification
aforesaid, 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 Statutes made for that purpose.