{So) 
cur , when fuch Adits are wrought or driven inward upon a 
Level, ov near it, 20, 30, or 40. fathom, morcor lefs: Afwel 
becaufe of the expence of naoney, as of time alfo ^ in the Qrdu 
nary w2iy oi preventing or remedying thofe inconveniences- 
which isjby letting down Jhafts from the day{^s Miners fpeak) 
to meet with the Jdit ; by which means the Air hath hberty 
to play through the whole work , and fo takes away bad va- 
pours and f urniflies good Air for Refpiration. The Expence 
of which /hafts, in regard of their vaft depth , hardnefsof the 
Rock, drawing of water ^^.doth fometimes cqual,yea exceed 
the ordinary charge of the whole ^i//. 
AmongA the Expedients that have been devifed to remedy 
this, there is one pracStifed in the Coal-mines^ near the Town of 
Liege or Luyekj thatfecms preferable to all others for Effi- 
cacy 3 Eafe, and Cheapnefs ; the defcription whereof fol- 
loweth. 
At ihz mouth or entry of the Jdit there is a ftrudure raifed 
of Bric\^ like a Chimney 5 feme 28. or 30. foot high in all : at 
the bottom,two oppofite fides are (or may be) fome 5^ foot 
broad; and the other two^ 5. foot : the wall i[Bric\ thick. 
At the lower part of it^ is a ho!e._, fome 9. or i o. inches fqaare, 
for taking out of the Aflies, which when it is done, this Afli- 
hole is immediately ftopt fo clofe, as Air cannot poflibly get 
in at any part of it. Then^ fome 3, foot above ground or 
more, there is on that fide, that is next to the Jdit or Pit, a 
fquar^ hole of 8. or 9. inches everyway, by which the Air 
enters to make the Fire burn : Into this hole there is fixed a 
fquare Tttl^e or Pipe of Wood, whereof the Joints and Chinks 
arc fo ftopt with Parchment pafted or glewed upon them,, 
that the Air can no where get in to the Pipe but at the end : 
And this Pipe is ftill ^engthned , as the Jdtt or Pit advanceth, 
by fitting the new Pipes fo , as one end is alwaies thruft into 
the other , and the Joints and Chinks ftill carefully cemented 
and ftopt as before. So the Pipe or Tube being ftill carried 
on, as near ns is neceffary, to the wall or place , where frefli 
Air is requifite 3 the Fire within the Chimney doth ftill attratft 
(fo 
