COAL MINING. 367 
in the coal regions of England and continental Europe than all other 
fans combined, is yet mainly confined in this country to the anthracite 
region of Pennsylvania, because such costly and elaborate arrangements 
as attend its construction are not required to produce the limited cur- 
rents of air which suffice for our shallower and smaller mines. From 
250,000 to 300,000 cubic feet of air per minute are frequently produced 
by means of the larger Guibal fans in the mines of England. 
The Champion fan, which was introduced into the mining regions 
of Ohio and other western States a few years ago, gives very satis- 
factory results. Wherever this fan has been introduced, mining en- 
gineers and mining bosses declare that they could not be hired to go 
back to the furnace as a ventilating power. 
\ eee VM 
—_ 
WY 
Ir it 
i Kil 
ae 
aa 
i ih 
LD i o “ : 
it wil t | 
i HUH MU 
ZA TH aN GN ATE ae 7 
tot = 
3 
OU 
tidy 
. . 
' ' 
BU 
o 66 
101 fo 
Ao 
' 
Ho 
li 
bene em www ens mensecnmsensaem al ~— 
: ci 
= = me 
wnaeg 
ee 
. ne 
A 
—$$<$<_—__ 
Wid 
g Zi Z 
‘L {0% 
EAS im Di Dy TWN A 
i ii f re 
\\ 
CHAMPION FAN. 
