(fo to fpeak) Air through the Tube, without which it cannot 
burn, which yet it will do , as is obvious to conceive , (all II- 
luftrations, and Philosophical Explications being here Super- 
fluous,) and fo, while the Air is drawn by the fire from the far- 
theft or moft inward part of the Mine or Adit y frefh Air mu ft 
needs come in from without, to Supply the place of the other, 
which by its motion doth carry away with it all the vapors, 
that breath out of the ground \ by which means the whole 
Adit will be alwaies filled with frefh Air,fo that men will there 
breath as Purely as abroad , and hot only Candles burn , but 
Fire, when upon occafion there is ufe for it for breaking of 
the Rock. 
How that there may be no want of fuch frefh Air, the Fire 
muft alwaies be kept burning in the Chimney , or at lead as 
frequently as is neceffary : For which purpofe there muft be 
two of the Iron Grates or Chimneys, that when any accident 
befals the one, the other may be ready to be in its place, the 
Coals being firft well kindled in it: but when the fire is neer 
fpent,the Chimney or Grate being haled up to the dore,is to 
be fuppHed with frefh fuel. 
The Figure of the Fabrick, Chimney, and all the parts 
thereof being hereunto annexed } the reft will be eafily under- 
ftood. 
A. The Hole For taking out the Allies. 
B. The Square-bole , into which the Tube or Pipe for convey- 
ing the Air is to be fixed. 
C. The Border or ledge ofBru\ or Iron , upon which the Iron- 
grate or Cradle , that holds the burning Coles,is to reft, the one 
being exadfcly fitted for the other. 
D. The Hole where the Cradle is fet. 
E. The woodden Tube , through which the Air is conveyed 
towards the Cradle. 
F. The Dore , by which the Grate and Cradle is let in 3 which is 
M 2 
to 
