466  Iniprovements upon Fire Grates, Stoves, &e. 
fents an horizontal fection of the bafement or pedeftal, 
which is fuppofed to be open, fhewing the drawer in its place, 
with the cavity behind it,) will be found to anfwer every pur- 
pofe. The cavity G is feparated from the place in which 
the drawer is put, by a partition (beft made of plate or caft- 
iron) pafling from H to H, in which there is an opening I, 
with a cover K. To the cover K is attached a fmall bar L, 
worked by another fhorter bar M, to whieh it is attached 
by any fimple joint. The bar M is faftened into an upright 
‘pivot, the top of which comes up through the pedeftal at 
one of its corners or any othér convenient fpot, and is fur~ 
iifhed with a button to be laid hold of by the fin ger and 
thumb, or with a top fitted to a key, by the turning if which 
the cover K is made to fhut or open the aperture I, and con- 
fequently to prevent or facilitate the paflage of the air from 
the hole at G, which reprefents the internal mouth of the. 
air-tube, the other end of which ts on the ouffide, of the 
houfe, or in any cellar or other apartment, as before de- 
fcribed. When the air has paffed through the aperture I, 
it finds no difficulty in pafling on to the bottom of the grate, 
that back or fide of the drawer next which the aperture is - 
being made Jow to allow it to flow m freely. 
The grates are recommended to be made of a circular or 
elliptical form, as beng moft convenient, where the fence or 
fereen, to be immediately defcribed, is wifhed to be apphed 
along with Mr. Burns’s other improvements. The fence is 
intended to prevent thofe dreadful accidents, which too fre- 
quently occur, of women’s and children’s clothes being fet 
on fire by fparks from the grate. When it is wifhed to be 
adopted, the infide of the chimney, where the grate is to 
ftand, had beft be a femi-cylmder, or nearly fo, (as repre- 
fented in Fig. 3,) with a lining or cover gaa, belt made 
of metal, at fuch a diftance from the femi-cylindrical wall, 
NNNN, as to give fufficient room for allowing the fafe- 
guard or fence to be flid round mto it when the fire is 
withed to be left open, when frefh fuel is ‘to be added, or 
when the drawer with the afhes is ta be removed, 
- The fence is a frame-work of metal, which, when filled 
ore with glafs of with wire-work, foci a portion of a cylin- 
der 
— ee 
: 
¥ 
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