
1800. ] 
in common fires it is well Known that the 
air neceflary for confuming the fuel, is 
{upplied from the room itfelf, chiefly the 
lower part: and hence where there 1s a 
brifk fire, and the chimney only wide 
enough to convey away the fmoke and 
heated air, there is a conftant current of 
cold air rufhing in under the door, be- 
tween the window frames and through 
every crevice of the room, in order to keep 
‘up the neceflary fupply. On this account 
the room is indeed well ventilated, but 
not fo much or fo uniformly heated as if 
the fire were fupplied from without with 
air, and that in the room not fo conftantly 
changed. The fire-placehere recommended 
is en elegant ftove of the form of an urn, 
open at the top, and fet in the ufual recefs 
for the fire. This ftove has a grate at the 
part where it begins to grow narrow, and 
beneath this, an air pipe not communicat- 
ing with the room, but paffing, where it 
can be done, between two of the joifts un. 
der the floor, and opening at the outfide 
of the houfe. The fpace lying between 
the grate and the air pipe, or that which 
forms the pedeftal of the urn-fhaped ftove, 
is a kind of moveable drawer that colleéts 
the afhes as they fall from the fire, where 
they remain without flying about into the 
room, and may be taken out and emptied 
at anytime. ‘The air pipe is fa contrived 
as to pafs quite under the pedeftal, and to 
be then reflected backwards and upwards, 
fo as to enter the cavity of the ftove juft 
above the drawer for the afhes. Where 
the further orifice of the air pipe cannot 
be conveniently carried to the outfide of 
the houfe, it may be made to open into 
a cellar or any cool room, and it will alfo 
have the advantage of keeping this room 
always fully ventilated without giving it 
any heat whenever a fire is burning at the 
grate in the other end of the pipe. 
The patentee has befides conne&ted with 
this invention, a contrivance for applying 
a femicircular fafeguard or high fender of 
wire-work, to prevent the dreadful acci. 
dents that have fo frequently arifen from 
the cloaths of ladies or children catchin 
fire. 
The improvement here introduced ap- 
pears to be one which merits public at- 
' tention, for it is unqueftionable that in the 
| prefent way of warming our apartments, 
we recieve much lefs benefit than we ought 
from the quantity of fuel confumed. 
This defect will certainly be remedied in 
part by the prefent contrivance, and will 
render rooms lefs obnoxious to thefe cur- 
rents of cold air fetting in from the door 
to the fire place, which are fo juftly com- 
Montrriy Mae. No. 57, 
New Patents lately Enrolted. | fe 
he 
"plained of. At the fame time the view ofa 
fire, which is fo neceflary to Englith ideas 
of a comfortable fire fide, will bein a great 
meafure retained by the open fpace at the . 
top of the ftove. With regard to the 
novelty of this invention, it is fimply in 
applying to the parlour a very well 
known and not very uncommon con- 
ftru€tion for furnaces for chemical pur- 
pofes. The fuperior advantage of bring- 
ing a ftream of cold air from without to 
fupply the furnace, inftead of the heated 
air ofa laboratory, has been known to every 
chemift in every country for centuries 5 
and the very conftruétion here mentioned 
of confining the draught of a fire place 
to an air tube communicating to a diftant 
part, has been practifed in various in- 
ftances. =~ 
en 
MR. CLAY’S FOR BUTTONS. 
A PaTeENnT was granted in February 
laft, to Mr. Henry Cuiay of Birming- 
ham, Japanner, for a new method of ma- 
nufacturing buttons out of a material not 
before ufed for that purpofe. 
The material here made ufe of is flate, 
cut into thin layers, fo as to be readily 
worked. The piece of flate is firft cut or 
filed into the form of a button, leaving a 
crofsat the top to receive the knot of the 
catgut or filk, which is to be put through 
holes perforated through the flate, and the 
ends afterwatds tied in a knot, to keep 
them faft to the flate. ‘Then another piece 
of flate is tobe glued to the top of the 
former piece, and the button finifhed by 
turning ina lathe... A metal ftud and 
fhank: may be added, if neceflary, by ce- 
menting it to the flate cut ina proper 
form. — 
RE 
MR. HINDMARSH’s FOR A POWER. 
A PaTENT was granted laft November 
to Mr. Ropert HinpMarsnH of Wai- 
worth, Surrey, Printer, for a method of 
applying an elementary. power to any kind 
of machinery. 
The curious and aflonifhing effets of 
the preflure of water in proportion to its 
height, and not depending on its bulk, is 
known to every ane acquainted with the 
firft elements of hydraulics, under the ap- 
pellation of the hydroftatical paradox. 
The invention claimed by. the patentee, 
is in the application of this law of fluids 
foas to producearegular power, forthe 
purpefes of machinery. ‘This is done in 
the fimple method given inthis fpecifica- 
tion, by providing a cylinder, containing 
amoveable pifton water-tight, with a rod 
working through a ftufhing tox, alfo water- 
Pp } tight 









