; ■ What Air-fhaft belongs to the Mine > Whether it be 
Jingle / or more than One? Of what breadth the Air-fhaftis at 
the Orifice ? Whether it be convenient enough , or not ? How 
neer it is placed to the Groove 5 and in what pofition ? And if 
there be fever d Ajr-fhafts what their Diftances and fcituatiom 
are in reference to the Groove., and to each other ? Or how Air 
is £upplied 3 if there be no Airdhafts ? 
36 . Whether they meet with any Waters in the Mine ? And, 
if they do, how copious they are 3 at what depths they occur* 
how they are qualified 3 andwhat way they Spring, &c. 
37. Whether they are conftant or temporary ? whether they 
increafe or diminifii notably in Summer or Winter, or at any* 
other time of the year 3 and if they do, at what feafonthat is; 
how long it is wont to laft 3 and the proportions of Increafe and; 
Decreafe? 
38. What Expedients and Engines are employed to free the 
Mines from Water ? The materials , the parts , the bignefs.the 
ihapes , the coaptation 3 and , in ihprt , the whole ftrufture, 
number, and way of applying the Inftruments , that are made. 
ufe off to free the Mines from W ater ? 
39. What are the Conditions, Number, &c. of the Adits .<? 
40. Whether the Mine be troubled with Damps , and of 
what kind they are? whether they come often or feldom at any 
fet time , or altogether irregularly ? what Signs fore-run them > 
what* mifchief they do ? what remedies are the moft fuccefs fully 
imployed againft them , afwell in reference to the Cleering of 
the Mine , as to the Prefervaticn and Recovery of the Work-, 
men ? 
41. What Methods the Mine-men ufe in following the Vein/ 
and tracing their pafiages under ground (which they call Vium •=>- 
ming and Dy ailing) according* to the fevcral exigencies ? And 
whether they employ the Inftruments,made with the help of the 
Load-ftone , the fame way that is ufual 3 and if not , wherein 
they differ in the ufe of the fame Inftruments 3 or ^what Infirm- 
ments they fubftitutein their place ? • , 
42. What ways .they take to fecure themfelves from the un- 
certainty , incident to the guidance of Mapzetick Needles from 
the Iron-Stone or Ore', that they may meet with under ground? 
