PRODUCING STEAM BY MEANS OF A MACHINE TO BE USED IN ENGINES INSTEAD OF THE COMMON BOILER, AND ALSO APPLYING THE SAME MACHINE IN WORKING ENGINES OF EVERY DESCRIPTION WHERE STEAM IS USED, AND SO AS TO RAISE AND PRODUCE A VERY LARGE QUANTITY OF STEAM WITH VERY LITTLE FUEL, UPON PRINCIPLES NOT HERETOFORE PUT IN PRACTICE
Year: 1791

page_text: TESCHEMACHER'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
ROGER TESCHEMACHER, of the Parish of Clarborough, in the County of Notting-
ham, Gentleman, send greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of Great Britain, bearing date the Twenty-
fourth day of May, in the Thirty-first year of His reign, did give and grant
unto me, the said John Roger Teschemacher, His especial licence that I, the
said John Roger Teschemacher, during the term of years therein expressed,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and Town of Berwick upon Tweed, my Invention of "PRODUCING
STEAM BY MEANS OF A MACHINE TO BE USED IN ENGINES INSTEAD OF THE COMMON
BOILER, AND ALSO APPLYING THE SAME MACHINE IN WORKING ENGINES OF EVERY
DESCRIPTION WHERE STEAM IS USED, AND SO AS TO RAISE AND PRODUCE A VERY LARGE
QUANTITY OF STEAM WITH VERY LITTLE FUEL, UPON PRINCIPLES NOT HERETOFORE PUT
IN PRACTICE;" in which said Letters Patent there is contained a proviso obliging
me, the said John Roger Teschemacher, under my hand and seal, to cause a par-
ticular description of the nature of my said Invention, and how the same is to be
performed, to be inrolled in His Majesty's High Court of Chancery within
one calendar month next 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
John Roger Teschemacher, do hereby declare that my said Invention of pro-
ducing steam by means of a machine or boiler to be used in steam engines
instead of the boiler commonly used, and also of applying the same machine in
working engines of every description where steam is used, and so as to raise

page_text: and produce a very large quantity of steam with very little fuel, is founded
upon the following principles, that is to say :-
The water employed for producing steam is constantly in a running state
over inclined pianes or shelves which are in contact with the fire that commu-
nicates the heat to the said inclined planes or shelves. These inclined planes
or shelves may be put into different forms or shapes, and the annexed plan,
exhibiting three several views or geometrical elevations marked with the several
capital letters A, B, and C, will more fully explain the principles upon which
the said machine or boiler is founded, by or from which the same can be made,
and how the said machine is to be performed and used, viz, that part of the plan
marked with the capital letter A represents the top of the boiler, into which the
water is conveyed, and from which the steam issues, and also where a valve
may be put to regulate the steam. That part of the plan marked with the capital
letter B represents a front view of the said boiler with the different inclined
shelves, upon the inside of which the water runs. That part of the plan
marked with the capital letter C represents one of the side views of the said
boiler. The said plan marked with the said several capital letters A, B, and C,
compose or form the whole boiler or machine for creating steam, and which
may be made of metallic or any other substances capable of supporting a
continual heat of fire. This machine is to be immersed, fixed into, or put upon
a common or an air furnace with flues and registers constructed in such a
manner as will draw the flame of the fire the whole length of all or any of the
said inclined shelves or planes, as the strength or force of the steam is required.
That part of the plan above referred to marked with the letters b, represent
the inclined shelves or planes which are to be heated by the fire resting
against them. The inside of the shelves being constructed as to be steam-
tight and to admit a free course of the water, the water constantly making its
course backwards and forwards from one hot inclined shelf to the other, until
it reaches the bottom of the machine, and is then let out at an aperture
marked with the letter g. That part of the plan above referred to and marked
with the several letters c represents the steam pipe through which the steam
passes, and in which are contained four holes or apertures, which are marked
with the several letters d, and communicate with the inside of the boiler, and
by which the steain is let into this pipe from the boiler, and which pipe is
perfectly closed at that part of the said machine which is marked with the
several letters e, and the steam issues at the long end of the pipe which is
marked in the said plan with the several letters; from thence it is conveyed
by a pipe or pipes with regulators and valves of the same kind as are commonly
used for boilers to steam engines; this pipe marked in the said plan above

page_text: referred to with the several letters c may be surrounded by fire, and which will
then give a further expansion to the steam. That part of the machine
which in the said plan is marked with the letter g is an aperture into which
a bent pipe and cock are to be inserted; the said cock is intended to carry off'
the unevaporated water. That part of the said machine which in the said plan
is marked with the several letters h represent a flat aperture, into which a pipe
marked with the several letters k is fixed; this pipe conveys the water from
an elevated cistern into the boiler or machine. On the pipe a stop cock is to
be placed in order to admit more or less water into the boiler as occasion may
require. That part of the said machine which in the said plan is marked with
the several letters i represent the inside course of the water from one shelf to
the other; the instant the water falls on the inclined hot shelves it divides by
the heat into a number of small globules, which have but little contact with the
shelves, and expose a very considerable surface to the surrounding heat. That
part of the said machine which in the said plan is marked with the several
letters / represents an opening to which a regulating valve or valves of safety is
to fixed; this is to be opened whenever the steam is too strong or violent.
In witness whereof; I, the said John Roger Teschemacher, have here-
unto set my hand and seal, the Twenty-third day of June, in the year
of our Lord One thousand seven hundred and ninety-one.
Inrolled the same -Twenty-third day of June, in the year above
mentioned.