( 155: yj 
Trunks joyrfd'to the forcing Part^the Candle’ reviv’d, 
and burn’d, at laid,, as well as in the open x\ir. When 
I had left off Pumping, the Flame of the Candle di- 
ininlQi’d again; but' wllen 'it was ready to go out, it 
reviv’d again, upon forcing in'inorex\ir with the Engine, 
Remarks' ui^on ‘the E xperiments. 
W HEN Damps in Mines are fpecifically lighter' 
than common Air, they will be driven out of the 
Mine by the firft Experiment. . . , 
When Damps are fpecifically heavier than common 
Air, they un ay be fuck’d out by the Second or Third' 
Experiment. 
When a Sought or Adit^ is carried from a Mine to’ 
any diftant Valley, to difcharge the Water, or fave the 
Trouble of railing it quite to the Top of the Pit, Shafts^ 
or perpendicular Pits are generally funk from the Sur-' 
face of the Earth; to the faid Sough, to prevent the ' 
Workmen from being fufFocated as they dig the Sough, 
and that at a great Expence ; but, by the 4*^ Experi-^ 
ment, frelh Air may be driven down to the Workmen, 
to continue their breathing free and fafe, and to keep itr 
their Candles, by which Means the Expence -of •-per-' 
pendicular Shafts will be fav’d. 
' It has been found by feveral Experiments, that a 
Man may breath a Gallon of Air in One Minute, and 
a* Candle of Six in the Pound 'will burn nearly as long* 
in the fame Quantity of A\t ^ therefore the Model only 
is capable of fupplying frelli Air to One Man ; and con- 
fequently, a large Engine will abundantly fupply Air 
for-the burning of Candles, and the Working of a great 
Number of Men in a Mine, 
One 
