NEW STOVE 63 
Diameter of the air-holeattop, - 5) 4 Qiks 
——--—of the flame hole at bottom, - o 2 
To fix this Machine. 
Spread mortar on the hearth to bed the bottom plate A, 
then lay that plate, level, equally diftant from each jamb, 
and projeCting out as far as youthink proper. Then put- 
ing fome Windfor loam in the grooves of the cover B, lay 
that on: Trying the fliding plates Y Y, to fee if they move 
freely in the groves Z Z, V V, defigned for them. 
Then begin to build the niche, obferving to leave the. 
{quare corners of the chimney unfilled; for they are to be 
funnels. And obferve alfo to leave a free open communi-— 
cation between the paflages at K K, and the bottom of 
thofe funnels, and mind to clofe the chimney above the 
top of the niche, that no air may pafs up that way. The 
concave back of the niche will reft on the circular iron par- 
tition 1 A 4, figure 2, then with a little loam put on the 
box C over the grate, the open fide of the box in front. 
Then, with loam in three of its grooves, the grooveR R 
being left clean, and brought dire€tly over the groove QQ__ 
in the box, put on the cover D, trying the front plate E, 
to fee if it flides freely in thofe grooves. 
Laftly, fet on the vafe, which has fmall holes in the 
moulding of its bottom to receive two iron pins that rife 
out of the plate D at IJ, for the better keeping it fteady. 
Then putting in the grate H, which refts on its three 
knobs H HH againft the infide of the vafe, and flipping 
the drawer into its place; the machine is fit for ufe. 
To ufe it. 
Let the firft fire be made after eight in the evening or 
before eight in the morning, for at thofe times and be- 
tween thofe hours all night, there is ufually a draft up a 
chimney, though it has long been without fire; but be- 
tween thofe hours in the day there is often in a cold chim- 
ney 
