A CHAIN PUMP
Year: 1818

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
TYER, of Homerton, in the County of Middlesex, Gentleman, 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 called England, bearing date at Westminster, the Second
day of May, in the fifty-eighth year of His reign, give and grant unto me,
the said George Tyer, my exors, admiors, and assigns, His special licence, full
power, sole privilege and authority, that I, the said George Tyer, my exors,
adiñors, and assigns, should and lawfully might, during term of years therein
mentioned, make, use, exercise, and vend, within England, Wales, and
the Town of Berwick-upon-Tweed, my Invention of "A CHAIN PUMP;" in
which said Letters Patent there is contained a proviso, that if I, the said
George Tyer, shall not particularly describe and ascertain the nature of my
said Invention, and in what manner the same is to be performed, by an
instrument in writing under my hand and seal, and cause the same to be
inrolled in His Majesty's High Court of Chancery within two calendar months
next and immediately after the date of the said Letters Patent, that then the
said Letters Patent, and all liberties and advantages whatsoever thereby granted,
shall utterly cease, determine, and become void, as in and by the same,
relation being thereunto had, may more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the
said George Tyer, do hereby declare that the nature of my said Inven-
tion, and the manner in which the same is to be performed, are particularly
described and ascertained in and by the Drawings hereunto annexed, and the
following description thereof (that is to say):-
My improvement in the construction of chain pumps consists in a mode of
reducing the friction, and is performed by a peculiarly constructed spur wheel
carrying round the chain, the pistons being removed to a considerable distance
apart, and their number diminished accordingly.
Fig. 1 shews the spur wheel carrying the endless chain, attached to the
links of which are pistons or buckets, made of collets of leather flanged
together; these pistons or buckets are to fit the rising main A, and to be
placed at any distance from each other within thirty-two feet, the length of a
column of water raised in vacuum by atmospheric pressure; but I should place
them, according to circumstances, at distances not exceeding twenty-eight feet
asunder, knowing that the rising main will be a very imperfect vacuum.
Fig. 2 represents another view of the sur wheel, with the crank or handle by
which it is to be turned.
Fig. 3 shews that form and construction of the chain, which I prefer, com-
posed of double and single links attached together by rivets. The spurs of the
wheel falling into the apparatus of the double links carrys the chain round and
accordingly brings the pistons with a column of water up the raising main at
proper distances, as before expressed. The pistons are attached to the chain at
one of the links, being constructed with pivots for riveting as the single links,
shewn separately at Fig. 4. The endless chain must be of sufficient length to
reach some distance below the surface of the water, and passing up the rising
main (which is bell-mouthed at its lower opening) carries the piston and the
.column of water up into the box or cistern, the notches or cavities in the spur
wheel allowing the pistons to fall into them as they pass. By this contrivance
a great number of pistons or buckets which have been hitherto used to chain
pumps are dispensed with, a considorable portion of the friction removed, and
a large column of water raised from any depth with comparatively little labour.
In witness whereof, I, the said George Tyer, have hereunto set my
hand and seal, this Second day of July, in the year of our Lord One
thousand eight hundred and eighteen.
GEORGE (L.B.) TYER.

page_text: AND BE IT REMEMBERED, that on the Second day of July, in the
year of our Lord 1818, the aforesaid George Tyer 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.
AND BE IT REMEMBERED, that on the Second day of July, in the
year of our Lord 1818, the aforesaid George Tyer 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
5 written. And also the Specification aforesaid was stamped according to the
tenor of the Statute made for that purpose.
Inrolled the Second day of July, in the year of our Lord One thou-
sand eight hundred and eighteen.