1the air through the blow-hole and the
conduit into the shaft.
Although
this machine has no need of men whom it is necessary to pay to work the
crank, still when the sky is devoid of wind, as it often is, the machine does
not turn, and it is therefore less suitable than the others for ventilating a shaft.
this machine has no need of men whom it is necessary to pay to work the
crank, still when the sky is devoid of wind, as it often is, the machine does
not turn, and it is therefore less suitable than the others for ventilating a shaft.
In the kind where the fans are fixed to an axle, there is generally a
hollow stationary drum at one end of the axle, and on the other end is fixed
a drum made of rundles. This rundle drum is turned by the toothed wheel
of a lower axle, which is itself turned by a wheel whose buckets receive the
impetus of water. If the locality supplies an abundance of water this
machine is most useful, because to turn the crank does not need men
who require pay, and because it forces air without cessation through the
conduit into the shaft.
hollow stationary drum at one end of the axle, and on the other end is fixed
a drum made of rundles. This rundle drum is turned by the toothed wheel
of a lower axle, which is itself turned by a wheel whose buckets receive the
impetus of water. If the locality supplies an abundance of water this
machine is most useful, because to turn the crank does not need men
who require pay, and because it forces air without cessation through the
conduit into the shaft.
A—HOLLOW DRUM. B—ITS BLOW-HOLE. C—AXLE WITH FANS.
D—DRUM
WHICH IS MADE OF RUNDLES. E—LOWER AXLE. F—ITS TOOTHED WHEEL.
G—WATER WHEEL.
WHICH IS MADE OF RUNDLES. E—LOWER AXLE. F—ITS TOOTHED WHEEL.
G—WATER WHEEL.
Of the fans which are fixed on to an axle contained in a drum or box,
there are three sorts. The first sort is made of thin boards of such length
and width as the height and width of the drum or box require; the second
there are three sorts. The first sort is made of thin boards of such length
and width as the height and width of the drum or box require; the second