1801.] 
grind three hundred-weight of bark in.an 
hour; but as the plates may be made of 
any circumferetice,varying with the power 
by which they are moved, the quantity 
ground by the mill in a given time will 
be in proportion to the fize of the plates, 
and confequently to the power which moves 
the machinery. The advantages promiled 
by this invention are, a faving of bark,and 
an acceleration in the’procefs of tanning, 
as it is faid that bark, ground fine by this 
mil!, without being pulverized,» {pends 
more rapidly and more completely in the 
pits. 
—— 
MESSRS. WHITE and SMETHURST for an 
IMPROVED LAMP-BURNER. 
This is an improvement on the burner of 
the common Argand lamp, the object of 
which is to caule a more free and plentiful 
fupply of oil to the ignited part of the wick, 
by which means it may burn better, require 
fnuffing lefs frequently, and will burn with 
oil of an inferior quality. Thefe advan- 
tages are obtained fimply by leaving moue 
fpace between the two tubes within which 
the wick is confined than is ufually done, 
and in this the whole improvement of the 
Patentee appears to confift. It is necef- 
fary however to reduce to the ufual fize the 
{pace at the top of the wick, in order that 
the burnt cruft may be more conveniently 
bruthed off. This may be done by put- 
ting on a ring conicaly fhaped, fo as to 
bring the {pace at top to the requifite di- 
mention. 
The principle of improvement here is 
to take away the clofe adhefion between 
the fides of the unburnt wick and the 
tubes between which it is confined ; for, 
as this part of the wick is conftantly foak- 
ed in oil, it thereby adheres clofely to the 
fides of the tubes, and the capillary at- 
traction by which the oil is drawn up into 
the burning circle fof the wick, is thus 
much lefs than it would be if the wick 
were fimply hanging down loofely to the 
oil refervoir. At the fame time all the im- 
portant advantage gained by the Argand 
gonftruction is preferved egually well 
Correé? Lif of New Publications. 45 
merely by the ring at the top of the wick- 
tube. The Patentees fuggeft other me- 
thods of conftructiug the tupporters of the 
wick, as for inftance, by fupporting a ring 
upon pillars or bars, or by making flits or 
openings in the fides of the tubes, and the 
like, all of which will enfure the fame ad- 
vantages. 
One of the moft important benefits 
which the Patentees affert will be derived 
from their improved lamp, is to enable the 
wick to burn common whale or feed-oils, 
which are fold nearly at half the price of 
the beft {permaceti oil, and it is probable 
that, if the lamp burns well, little, if any, 
of the offenfive fimell occafioned by thele 
oils, when burnt in the common way, wili 
‘be perceived. 
Eee 
[The following Patents have lately been 
obtained in America. | 
MR. JAMES COX, of Rahway, iu Eaft Fer- 
Jey, for a MACHINE to fave LABOUR in 
VAN- YARDS. 
It confifts of fets of frames adapted to 
the vats on which the hides are to be 
ftretched, and fecured in fuch a manner as 
to be both ina fituation to be acted upon 
by the fluid in which they are immeried, 
and to be eafily lifted out for airing, by 
the ftrength of one or two men. - Thus in 
the operations of foaking in common wa- 
ter, in lime water, &c. the hides are 
handled with very littie expenditure of 
time or ftrength. 
a 
MR. WILLIAM YOUNG, of ConneGiicut, for 
(@ NEW MODE Of raifing SASH-WINDOWS. 
This is pertormed by means of cork, 
&c. in the fimpleft poffible manner, with 
{carcely any expence. The contrivance is 
the following: Three or four holes are 
bored in the fides of the fafh, into which 
hole common bottle-corks are inferted, 
projecting about the fixteenth of an inch. 
Thefe prefs againft the window- frames, 
along the ufual groove, and by their 
elafticity fupport the fafh at any height 
which may be required. 
— 
LIST or NEW PUBLICATIONS in JUNE, 
EE 
AGRICULTURE. 
The Cafe of the Farmers; with a Dedica- 
‘tion to the Board of Agriculture ; and an 
Addrefs to all Prefent and Future Writers on 
Agriculture, by a Hertfordfhire Farmer, 8vo. 
are 8 Badcock, 
BIOGRAPHY. 
Memoirs of the Jate Mrs. Robinfon, writ- 
ten by herfelf ; including Anecdotes of ma- 
ny diftinguifhed Perfons of the prefent Pes 
riod ; with Poems and Letters never before 
publifhed, written by herfelf, or addrefled to 
her 
