Star.
London, England, 1811-05-17 00:00:00

WOOLF'S PATENT STEAM ENGINE

11 IHE following A tEd.ivita and C rtifiCertes ate rt.
spec fully submitted to those who at. mtere-te.l in ihe eco-
nomical applicants', of Mechanical Power., to the purpobes of
Mining and Meidifdetirres, as a complete taimation ut every re-
port to the prejudice of WOOLF' Itivehttun, circulated by ir.des
ranee and malevoletc.oe.NDoti
TO WIT:
James Young. of Laystall.strret, London, 'Etetneer, maketh
oath aid /anti, that lie had the principal sayssinten.lance of a
Stearn Engine, on the premiers of Meows. Mese aad Co. Brewers,
Liquorpood.street, of Mr. Arthur Wog,h s pretit couttruction,
estimated at 36 horses power, from the time that the said Engine
was erected till the same was removed, and an enshie of the oasts
nufacture of Messrs. Bolton and Watt substituted id its place;
and that, by repeated experiarMts nude with the said Arthur
Viroolfs Engine, .to ascertain the quantity of fuel necessary to
work the said Engine, performing all the uso 11 w,rk of the brew.
house, it was proved, that the quantity of co.ia required did not
exceed Carto bushels each hour, oo the average co the whole day's
work,consistingusually,wben io foU work,otfru.o 17 to IS hours,
The deponent cannot say any thing rave, thug quantity oi
coals required to work the afiresaid Engine, erected by Messrs.
Bolton and Watt, having left the employ of Mrs:, .. M. ex sod
Co. before the said Engine was employed to periurni, the ful
work of the Brewhoose. JAWS Yocum.
Sworn before me, at the Mansion House, London,
the 20th day of April, I ell.
J. 1. SMITH, Mayor.
LONDON TO WET:
Henry *tumble, employed by Messrs. Mors, Reds, and Co,
Brewers, Liquorpond-weet, London, to look atter and attend

Steam Engines upon their premises, maketh oath and Stith, that
in conjunction with James Young, he bad the care and superin-
tendence of a Steam Engine, erected by Mr. Arthur Wadi, ac-
cording to his na.ent lniprovements, estimated at thirty-sit
horses power,upon the premises of the said Meters.Meux, keels,
and Company, and that the said Engine was worked during an
experiment continued for several days trent four o'clock in the
morning till nine o'clusk at night, doing all the usual work at the
house, with not more than two bushels of coals per hour on the
average of the whole day ; ihat the said Engine,erected by Mr.
AnhurWoolf, having been removed ater doing tke regular work
of the house for a considerable time, and a new Engine having
been erected in its stead, by Messrs. Bohan and Watt, of thirty
horses power, of which be has ever since had and now has the
superintendence, be has repeatedly tried what fuel is required by
the said new Engine of Mestrs. Bolton and Watt, to do the sane
work that was performed by the Engine erected by the aforesaid
Mr. ArthurWoolf;--tbat the said new Engine of Messrs Bolcom
and Watt's erection require., ou the avenge of the whole day',
werk, not less than four bushels of coals for every hour the En.
glue is worked; and that the last-mentioned Engine requites to
be worked on the average, daily, from twenty to tweparcvs
hours, to perform the same work that was done by Mr.Wooirs
Engine, on the average, dally, in se:teat/en hours.
Nanny konsit.
Sworn at the Mansion-House, London, die atitissloy
of Anvil, lin!, before me,
I. I. SMITH, Mayor.
N.B. Messrs. Mein and Co. were induced, by the sucestlons
and recommendation of a certain Euginew, to termer the Entire
erected on their premises by Mr. Woolf, and to get in its need
an Engine from Messrs. Bolton and Watt's Manufactory. 'l hat
Engine has now been a. work for some time, and it appears,
from the above affidavits, that, by the change, Messn.Meux and
Co. are put to a daily additional expence of the value of from
forty►ia to forty-eight bushels of coals—above one thous:id
pounds per annum, allowing the Engine to work for only ulna
months in the year.

CERTIFICATE.
This is to certify, That the undersigned had a Steam-Engine on
his premises, at Fulham, estimated at eight horses power, crated
by Jonathan Dixon, on Bolton and Watt's principle ; and that he
believes the said Engine performed about the same quantity of
work that engines of that size usually do ; and that it con►umed
rather more than one bushel of coals per hour. He further ctr-
tlftes, that be afterwards had a Steam-Engine of 16 horses power,
erected by Robert Archibald, en Bolton and Watt's principle,
and that when this Engine was fully loaded, it required more
than sti bushels of coati per hour ; that the said Engine (not &leg
of sufficient power for biz work) was removed, and be employed
Messrs. Woolf and Edwards, of Mill-street, Lambeth, to alter

the same On Mr Woolf's Patent rineiple, to an Engine estimated
at 24 horses power—that the said Engine, when so altered, was
attic to eery an his work, atnouoting to 1-td more than the tc
&horses power Engine could carry ; and that, with this .oultio::31
load, abs was able to do her whole work, without requiring moot
than one bushel (say 841b5.) of Newcastle coals per hour.
Loi.don, 111 k Feb. 1811. WILLIAM HART.

CERTIFICATE.
This is to certify, That we the undersigned, were present on
the 14th of March, liill, en the premises of John Hodgior, Esq.
and Co. at Battersea, to witness an experiment made with a
Steam-Engine 4 eight horses power, erected by Messrs. Bolton
and Watt, to ascertain what quantity of wheat could be ground
by the said engine with agleam quantity of coals. The engine was
in good working condition, the mill stones in good order, and Ahe
experiment was made with one pair of stones, French burs, 4
feet 2 inches diameter.
The Engine was worked with proper care and attention for
three hours and 50 minutes, and in that time ground duce qt..ir-
ter. seven bushels and a half of wheat, Winchester
with five bushels and one-third of a bushel of coals. The ru'ght
of the wheat was 59 pounds, neat, per bushel. The coals were
from Collingwood Main, 446 pounds.
JAMIIS 80/VT*ON Engineer.
J410:4 Ptnn, Engineer.
Ricotta Piste', Miller.

London, RICKAILO Dewasear,
April 17, Isll. Gm. NtcuoLs, Miller at Messes. Hodgson.
CERTIFICATE.
- -

This Is to certify, That we, the undersigned, were pretest ea
the 17th of April, 1811, on e premises of Menrs. Wok and
Edwards, Mill-street, Lambeth, to witness an experiment mx,:e
with a itearn Engine, constructed by them no Mr. Wolf'sratent
principle, to ascertain what quantity of wheat could be ground
by the said Engine wnh a given quantity of coals. The Engine
was in goad working condition, the mill-stones in good order,and
the experiment was made with two pair of stunts, French lows,
4 feet diameter.
The Engine was worked with proper care and attention for S
Yours and 44 atixutes, and in that time ground SS bushels of 's heat,
Winchester measure, with 1 bushel, S pecks and 14 pounds, (0.1
161 pounds) of Coats of Collingwouil Mile. The wtighi o:
Wheat was 5911/s. neat, per bushel. The Engine is estimated at
li).ses. power.
RICVARD 'firectraict, Engineer. •
JAMES MILTON., Ellglileer.
• 101 IN Pass, Engineer.
RICIIARS 1011.1tC1, Miller.
1it1ed.11.22 Dee/ONLY Miller.
Gamma Idicaott.s, hillier, at Messrs. Hodgoots
Metier HARVIII, Iron Founder.

TO-MORROW.
flue rises Sun sae, I Moon rises,
10 rninnpio after ISO ndnoto after 7I SO inintnes after S

Londe', April 17, 1311.
From the above certificates it appears, that with one of Messrs.
Bolton and Watt's best Engines of eight horses' power, not
six bushels of Wheat, Winchester measure, can be ground it.:e
Flour, with one bushel or slabs. of Newcastle Coals ; and not
with the same quantity of Coals, Wolf's Nine.borse Lngile
ua
grimed upwards of 17 bushels of the same Wheat. In oiler words,
Wolf% Engine, with one bushel of Cials, can lift from 116 to 4o
millions of pounds one Mot high ; but Messrs. Bolton and
Engines, of the same size, only trout 12 to 1$ nulhons of pettul
one foot high. •
Orders for Woolf Patent Steam Engine executed by Wvoll
and EDWAJCDS, at their Manufactory, Mill-street, Lambeth.
Entiln, try applying to the Patentee, AtTillia Wool.r, No.
2, Saville-place, Lambeth Walk, may be accommodated with Li-
cense* to construct these Engines, on equitable terms.
N. B. Engines on Mr. Watt's principle altered son to sap
brace Woult 'a improvement, at a trifling expence.

HIGH WATER AT LONDON 11A.DCA TO-N1011.11.01i.
Morning .......»...... SO minutes a.:cr 11
Alkernoot. . minutes after 1

LONDON $ Print ni and published by Levitt t or, a: the :• $
attics,No. 1 ,Caroy-sve*t, sad at the Ofisst, TernPi, 31r.