A STEAM ENGINE ON AN IMPROVED CONSTRUCTION
Year: 1801

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, WILLIAM
HASE, of Saxthorpe, in the County of Norfolk, Engineer, sends greeting.
WHEREAS in certain Letters Patent, under the Great Seal of the United
Kingdom of Great Britain and Ireland, bearing date the Fourteenth day of
May now last past, reciting that the said William Hase had, by his Petition,
represented to His Majesty the King of the said United Kingdom, that he had
invented "A STEAM ENGINE ON AN IMPROVED CONSTRUCTION," by which a con-
siderable reduction would be made in the consumption of coals, which he
conceived would be of great public utility, and also reciting that he thereby
prayed that His Majesty would grant to him, his executors, administrators, and
assigns, His Royal Letters Patent under the Great Seal of the said United
Kingdom, for the sole use, benefit, and advantage of his said Invention, within
that part of Great Britain called England, the Dominion of Wales, and the
Town of Berwick upon Tweed, for the term of fourteen years, and that His
said Majesty has condescended to the Petitioner's request, there is contained
a proviso that if the said William Hase should not particularly describe and
ascertain the nature of his said Invention, and in what manner the same was
to be performed, by an instrument in writing under his hand and seal, and
cause the same to be inrolled in the Court of Chancery within one calendar
month next and immediately after the date of the said Letters Patent, that
then the said Letters Patent and all liberties and whatsoever thereby granted
should utterly cease, determine, and be void.

page_text: NOW KNOW YE, that in compliance with the said proviso, 1, the said
William Hase, do hereby declare that the nature of my said Invention, and
the manner in which the same is to be performed, are herein-after particularly
described and ascertained, that is to say:
In my improved steam engine the furnace, boiler, cylinder, piston, and
moving parts in general are constructed of such figures and dimensions, and in
such relative positions, as experience has shewn to be best adapted to the intended
effect of affording a first moving power, and as are well known to engineers
and other competent workmen, and in which said construction I pretend to no
originality, and consequently claim no exclusive privilege under the said Letters
Patent; but whereas in every steam engine hitherto constructed or known the
supply of water to the boiler hath been either cold, or warmed to no higher
temperature than can be produced by the combination or mixture of the cold
injection water with the condensing steam, (which temperature, when the injec-
tion is sufficiently copious to produce a good vacuum, cannot be much elevated,)
I do hereby declare that the great advantage and novelty of my said Invention
consists in that the supply of water to the boiler is made at a temperature at
or very near the boiling point, notwithstanding the injection is made in suffi-
cient plenty to produce as perfect a vacuum as can ever be had in any steam
engine. To accomplish this desirable purpose I cause a small or moderate
sized reservoir, trough, or receptacle to bé constantly supplied with heated
water, to be drawn out of the engine by the air pump as usual, and I cause
(by means of a small pump or other suitable and well-known apparatus) this
water to circulate through pipes or other vessels of communication.disposed
within the pipe or passage leading to the condenser, (or otherwise I cause: the
water to pass on the outside of the said pipes, as may occasionally be found
convenient) so that the steam in its course to meet the injection water must
and shall necessarily apply itself in contact with the external surfaces, of the
said pipes or vessels of communication, and impart or give out much of its heat
through the solid matter of the said pipes or vessels of communication to the
*water included therein; which, being conveyed in its course again into the small
Freservoir, trough, or receptacle before mentioned, will speedily raise its contents
nearly to the boiling point. In a convenient part of the said pipes or vessels
of communication through which the said heated water is urged there may
be an enlarged part from which (or otherwise, if there be no enlarged part,
'then from the said pipes themselves,) a pipe must proceed from the boiler,
forming a communication therewith, as occasion may require, by the usual
method of a floating valve, or otherwise. The pipes must be so conducted or
directed with regard to the elevation of part of the included column of water

page_text: that it shall be easier for a portion of the said water to flow or be urged into
the boiler (while the valve is open) than to be driven onwards through the
whole course of communication by the small pump or apparatus, so as again to
enter the reservoir, trough, or receptacle before mentioned. By this means a
supply of very hot water will be always kept in readiness during the working of
the engine, of which water such a portion will enter the boiler as the necessary
consumption of steam shall require; and the heat of this supply will be little, if
at all, checked by the introduction of so much water as the reservoir, trough,
or vessel may also demand from the air pump; in consequence of which the
quantity of fuel required to be consumed in order to produce a determinate
quantity of steam will, under like circumstances in other respects, be less in
my said improved steam engine than in any other.
In witness whereof, I, the said William Hase, have hereunto set my
hand and seal, this Eleventh day of Junc, in the year of our Lord One
thousand eight hundred and one.
Sealed and delivered (being first duly stamped)
WILLM (L.S.) HASE.