124 
the whole of the rolling cylinder is 
grooved. 
Mr. HorneLower's, For STEAM 
ENGINES. 
_ Jn June, 1798, a patent was granted to 
JONATHAN HorNBLoweER, of Penrhyn, 
Cornwall, enoineer, for a new fteamen gine. 
In this machine the fteam from t&e 
boilers is admitted into other veffels, fo 
as to produce and comnuinicate to the 
machine a rotatory motion, without the 
Intervention of the ordinary apparatus : 
fome expence is faved in the frit ereétion ; 
afmaller quantity of fuel is neceflary, 
and lefs {pace is required for the engine 
to act in. 
Mr, Dixon’s, For STEAM ENGINES. 
In July, 1798, a patent was taken out by 
Joun Dixon, of Lambeth, engineer, for 
a new method of conftructing fteam engines. 
This new inftrument, however ingeni- 
ous in the conftruétion, is not very likely 
to be extenfively applied, on account of 
the air pump and quickfilver, which make 
an effential part of the machine. 
Dr. SHANNON’s, FOR IMPROVING 
THE PROCESSES OF BOILING, dc. 
In February, 1798, a patent was grant- 
ed to Ricuarp SuHannon, M.D. of 
Charlotte-ftreet, Paiicras, for improving 
the proceffes of boiling, brewing, diftil- 
ing, evapcrating, &e. 
Thofe who are acquainted with the ad- 
mirable effays of Count RumMFoRD, on 
the economical wife of fuel and heated 
fteam, will find nothing new in the priz- 
ciples of this patent, or, at leat, which 
may not eafily be thence deduced: Dr. 
SHANNON'S various application of thefe 
principles is ingenious, and promis to 
be of confiderable uie; but it is impoffible 
to explain it without minute details and 
engravings. 
Mr. MARLOW’s FOR A NEW METHOD 
OF BANGING WINDOW SHUTTERS, &c. 
In July, 1798, a patent was granted to 
RICHARD MarRLow, of Weftmintter, 
Jomer, tor a new method of hangine win- 
dow fafhes and fhutters, without the ap- 
pearance of lines and pullies. 
By this invention, the mechanifm for 
hanging the windows, 
in the wood-woark at the fides. 
Mr. BouttTon’s, ror Ratsine 
WATER. 
In the <¢ Monthly Magazine” for April, 
page 294, we firft announced this very 
interefting difcovery. We now proceed 
to perform our promife, and lay betore 
our reacers a copy of the fpecihcation, 
New Patents.—lMr. Boulton?s Patent. 
Zc. 18 concealed 
(Aug. 
illu&rated by 2 copper-plate. The im- 
portance and novelty ot the difcovery, 
will be a fumcient apology with our in- 
tellizent readers, for the {pace of our work 
which it occupies. 
““[ MaTTHEw Bou tron dohereby 
defcribe and alcertain the nature of my 
invention, and-the, manner in which the 
fame is to be perfcrmed, as follows; that 
is to fay, for the more clear defcription of 
the faid invention, it is proper to ftate its 
phyfical principle of action, 2s follows: 
_ Firft, when water moves or runs through 
a pipe, or clofe channel, er tube, if the 
end at which the water iffues be fuddenly 
ftopped, the water will (by its acquired 
motion, momentum, or impetus,) act 
upon the fides or circumference of the 
pipe ; which being fuppofed frong enough 
to refift that impetus, the water will if- 
fiie, with violence or velocity, at any 
aperture which may exift in or near the 
fhut-end of the pipe ; and, if to that aper- 
ture an afcending pipe be joined, a por- 
tion of water will rife ‘in it. 
. Secondly, if a pipe, open at both ends, 
with an afcending pipe, fuchas has been 
defcribed, be moved ae through ftand- 
ing water, in the direction of its length, 
upon fhutting the hinder part of the pipe, 
a portion of the water will rife in the af- 
cending pipe, in the manner which has 
been fiated in the former cafe, becaufe the 
water is relatively in motion, m refpect 
to the pipe. 
Thirdly, if, in either of the cafes re- 
cited, a pipe communicating with water 
at any lower level be joined to the main- 
pipe, at or near the end at which water 
enters into it, and if, when fuch water 
has acquired. motion relatively to that 
pir, (by the pipe being put in motion) 
the mouth or end at which the water en- 
ters is fuddenly fhut, the water, conti- 
nuing its motion relatively to the pipe, 
will draw or fuck up water. from the 
lower level, through the afcending pipe, 
in order to fill-up the vacuity occafioned 
by the water in the main pipe’s perfever- 
ing im its previous motion. What has 
been faid refpe€ting water, is alfo true in 
rvefpect to other fluids. ; 
The feveral cafes above ftated are re- 
folvable into the general principle of the 
refifttance which ‘water and other fluids 
(and in general -all>bpdies) make to a 
change of their ftate-of reft, or motion, 
whether abfolute or relative; and this 
principle has heretofore been applied to 
the raifing of water, only, in a compara- 
tively finall and weak degree, and in a 
defective manner. But the improved ap- 
paratug 
