f goo J 
NEW PATENTS LATELY. ENROLLED. 
MR. TAMES KNOWLES’S FOR TANNING. 
Mr. Knowles deferibes this invention 
in the following Terms. Firft, as 
foon as the wool or hair is pulled or 
taken off the fkin, the {kin or pelt f (a name 
vfeally given to the fkin in that ftate) i is 
sim ply dipped into water, and undergoes 
the operation of flefhing. 
Secondly. ‘Phe ikin or pelt is then dip- 
ped again into water, and it undergces an- 
other operation, called fkudding 5; after 
which it is in a ftate fit to be tanned, 
tawed, or dreffed. 
This proceis occupies much lefs time, 
and occafions lefs jabour and e expence than 
that hitherto prattifed, which ‘confifted firft 
of immerging the fkins in lime- pits, where 
they were depofited for feveral weeks, and 
were afterwards neceffarily obliged to be 
drenched or purified. 
The fpecificaticn of this Patent was 
dated the 27th ef April, 1799, and Mr. 
Enowles refides in the parifh of Lambeth. 
—SE Se 
MR. ECKHARDT’S- FOR GRATES. 
On the 3d of Otober, Mr. A. G. 
Eckhardt, coe peerage obtained 
3 Patent for improvement in the 
eonftruction a4 eae. by which they 
accommodate themielves to any propofed 
confumption of fuel, or any required de- 
gree of heat. 
The principle of this invention confifts 
in the new application of fpindles or racks, 
or wheels and pinions, or worms, or levers, 
by which the back of the grate may be 
moved in a horizontal or vertical dire&tion, 
and the bottom ina vertical direétion. 
The cheeks are moved horizontally in the 
ufual way, and they accommodate them- 
felves to the horizental motion of the back, 
by being conftru@ed of various plates 
which open cr fhut, dilate or contra&t, in 
the manner ef a fan. 
ee 
MR. BJSHOP’S FOR A NEW POWER. 
Mr. John Bifhop, of St. Paul’s, Co- 
vent Garden, enrolled a fpecifteation 
en the 23d of September, for a new 
method of creating a power by means of 
fire, water, and fteam, with or without 
conden{atign. 
Ths machine confifls of three parts. 
3. A wheel fimilar to an overfhot water 
wheel. 2. A large clofe vefiel or cafe, 
sade of copper or iron, in which the wheel 
is fixed, and is to work in a vertical di- 
rection. 3. An air or fteam pipe and 
walve, which paffes out at the top of the 
[ December, 
! 
clofe copper veffel, through a fmall refer- 
voir of cold water, for the purpofe of con- 
denfation, if neceflary. 
Motion is given to the wheel, and to 
any conne4Sted machinery, by the power of 
afcending fteam, i the following manner: “ 
The clolt copper veffel. in which the vertt- 
cal wheel is fixed, is filled with water above 
the axle of the wheel. The application of 
fire at the bottom of the veffel will raife 
the fteam ; and the fteam in its afcent, by 
entering ie and aéting upon the bucket 
of the wheel, will give ‘it a vertical rota- 
tory motion. The power thus produced, 
will be equal to nine pounds for every gal- 
lon of water employed. 
The quantity of fuel is confiderably re- 
duced by the produétion of a vacuum by 
means of the air or fteam pipe, or by 
ufing {pirits of wine inftead of water. 
ea 
MR. HOTCHKISS’S FOR A 
ria bie 
On the 3d of O&ober, Mr. Hotchkifs, 
a lieutenant in the navy, obtained 
Letters Patent-for anew mechanical.power 
for raifing weights, anchors, &c. 
Mr. Hotchkifs defcribes his power as 
acting on the principle of the fteelyard, put 
in motion and inverfed by means of a 
lever. 
Its practice he exemplifies in an upright 
fhaft, the lower end cf which is made 
thicker than*the upper end. A lever or 
power is then to be applied to the thicker 
part, and the two ends of the rope to which 
the weight is afixed, are made te turn in 
oppofite direGtions upon the thicker and 
thinnér ends of the upright fhaft. The 
weight is thus made to saffift im raif- 
ing itfelf by its own a aGion, in the fmaller 
part of the thaft, and the powerr required 
may be diminifhed in the proportion in 
which the diameters of the two ends of the 
fhait approximate. 
Fie gives another inflance of its more 
weil application, by two parallel cylin- 
ders of unequal diametérs ; one of which 
is turned by a windials or other power, 
and this turns the other cylinder, by means 
of tcothed or cogged wheels of equal 
diameters. “Zhe increafe of power 1s 
great, and is determined by the difference 
of the diameters.of thé cylinders, and by 
the approximation in fize. 
‘This appears to be a very interefting 
and ufeful invention ; but as it is difficult 
to-deferibe Simechanical apparatus, with- 
out the ufe of plates, we would refer thofe 
eur readers who wifh for further ine 
formation 
MECHANICAL 
of 
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a 
