DRAWING COALES, STONES, WATER, OR OTHER HEAVY BODIES OUT OF COAL MINES OR OTHER PLACES OF GREAT DEPTE, MORE EXPEDITIOUSLY AND AT LOWER PRICES THAN HERETOFORE
Year: 1749

page_text: STOKOE AND NEWTON'S SPECIFICATION.
EXPLANATION of the Engine invented by THOMAS STOKOE, of Bryan's
Leap, in the County of Durham, Gentleman, and Viewer of Collieries
and Coal Mines, and WILLIAM NEWTON, of Burnop Field, in the said
County, Gentleman, and also a Viewer of Collieries and Coal Mines,
for "DRAWING COALES, STONES, WATER, OR OTHER HEAVY BODIES OUT OF
COAL MINES OR OTHER PLACES OF GREAT DEPTE, MORE EXPEDITIOUSLY AND AT
LOWER PRICES THAN HERETOFORE;" for the sole use and exercise of which
His Majesty was pleased to grant His most grations Letters Patent
unto the said Thomas Stokoe and William Newton, their executors,
administrators, and assigns, for the term of fourteen years, bearing
date at Westminster, the Twenty-ninth of July, in the twenty-third
year of His Majestie's reign.
is engine consists principally of a large broad wheel ten yards and an
in diameter and thirty-three yards in circumference, round the periphery
hich a rope joyned at the extremities, and called an endless rope, is made
antly to wind as the wheel revolves, one half thereof continually descend-
and the other half ascending, the parts always equally balancing one
er. The force or moving power applied to turn the wheel is compounded
of the weight and the strength of animals, which may be either men, horses,
or other creatures; these by moving forward within the rim of the wheel
ascend from the lowest point of it, and thereby contributes towards its
ng round by their weight, and also being yoked or fastned at a proper
nce to a fixed prop or post and drawing thereat, their feet will forcibly
ar with the action of their weight, and both together give great power to
ircumvolution of the wheel; and N.B. the dimensions of the wheel may be
d at pleasure, so as to employ a greater or less number of animals as
cular conveniences and occasions may require.

page_text: For an example, suppose two horses, each weighing one hundred stone, to
be employed at once in this engine made to the dimensions as above, and
moving forward till the center of their gravity presses on the rim of the wheel
at thirty degrees distance from the lowest extremity of the vertical diameter,
then will the wheel be impell'd round with a force equal to an hundred stone
by their weight only, which is about the weight of forty-six pecks of coals,
Newcastle measure; and supposing the force arising by the draught of the
horses to be only sufficient to cancel or overcome the friction and other
impediments of the engine, and computing the horses to go at the rate of
three miles in an hour, they will draw up to the surface forty such weights in
an hour from the bottom of a pitt sixty-six fathoms deep, which will be equal to
eighty corves each containing twenty-three pecks of coals, Newcastle measure;
whereas the most advantagious machine now in use draws only at the rate of
thirty such corves in an hour out of pitts of the said depth, though the horses
therein employed go at the speed of five miles and an half per hour, and a great
number of them are required; but this engine is wrought by a much less
number of horses and will draw double the quantity of coals in the same
time and upwards, for there is a gaining both of two thirds in time and in
power.
In witness, the above-named Thomas Stokoe hath hereunto set his hand
and seal, the Twenty-first day of November, in the twenty-third year of
the reign of our Sovereign Lord George the Second, by the Grace of
God of Great Britain, France, and Ireland King, Defender of the
Faith, and so forth, and in the year of our Lord One thousand seven
Lundend and forte nine
Signed, sealed, and acknowledged by
the above-named Thomas Stokoe, the
Twenty-first day of November, in the
year of our Lord 1749, at the Town
of Newcastle-upon-Tyne, before me,
W
THOMAS STOKOE. (L.s.)
LYNSLEY,
A Master Extraordin' of the High Court of Chancery.