yNorkj w^defcend to the bottom of the Hill , where wc 
have that convenicncy , and at the loweft place begin as 
little a Drift, as the conveniency of working or driving 
wll permit (fcarcehalf fo big as that of the Load ) on a 
le'vel, till we come up to our work* And here becom es 
the uic of the D/^/needful^ which we term Vlummin^ and 
Dialling^ ( either to know the exad place of the Tin work, 
where to bring our Adit ^ or where to fink to bring down 
oxix Arr Jbaft even with thedefired placejperpendicularly^ 
or,toknowj which way our Load inclines^ when any flex- 
ures happen which is to be pcrfcrm'd in this manner^ 
viz, 
f5* A skilful perfon with an Affiftant, pen^ ink, paper, 
Sua*dialj andJong linej after his gueftof the place above 
ground, defcends intothe Adit , or work, and there fa» 
fteneththe one endof the line to a fixed things and then 
lets the incited Needle reft ^ exa&ly obferving, at what 
point it ftandsj with his pen 3 then he goes farther in the 
line ftill faftened^ and at the next flexure in the Adit makes 
a mark on his line, by knot^ or otherwifc , and fets his Diai 
down again 5 and there likewife notes down that point, 
on which the Needle ftands, at the iecond pofition 5 and- 
fo proceedsfrom turning to turning 5 ftill marking down 
the points and his line , till he comes to the intended- 
place 5 which performed, and eaftly fet down, he alcends, 
and begins at the orifice of the Adk or work, and repeats, 
what he did in the work 5 brings his firft knot, or mark fa 
his line to fuch a place, as the Needle will ftand at the 
fame point it did under-ground at the knot, and ib pro- 
ceeds till be come exafl-ly over the intended place in the 
Mine, 
14^ But to reminde what I was faying of Water, if this 
conveniency of an Adit may be had , then our water in^ 
jures U3 but a little, as longas we keep on that level with 
the Adit 3 for we drive not always on one and the fame 
level ; As for inftance^ At five fathom we make a drift 
bpth vvay^s^ and finking five fathom fliore^ we make ano- 
ther 
