The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1905-09-24

IS a secondary consideration. The fact is
that the heat is there, and whether it be
OF any OF the causes brought forth or
whether the devil himself is giving the
fires an extra stir does not affect the
case. The primary question is how To re-
move the heat. / noticed in the Miner
that the statement was made that the
mines in the Lake Superior district arn
not hot. There is a reason for their not
being so, and that is the ore carries little
or no sulphur, and the mines Of Butte
carry 20 per cent more or less. DecOmpO-
| sition OF the minerals results in setting
up heat This has been proved many
times IN the mines which upon occasion
nave been known 10 get on fire spontane-
ously examples of which have been seen
IN this camp, Arizona, Australia and 9TH
er foreign countries
Air expands with heat and contracts
with cold. as | have stated before. l will
give you a few figures to illustrate this.
For instance, air at temperature of g
degrees weighs $50 grains per cubic foot.
ana It's volume Is l00i at temperature OF
= degrees ii weighs $50 grains, and its
volume is l02: at 81 degrees its weight is
% grains, and volume l04; at % degrees
its weight is SIS, and its volume l06: at y
degrees its weight is sos grains. and its
volume 109; at s. degrees its weight is 495
grains and its volume III: at % degrees
its weight is 4S7 grains and its volume 1l5.
Heat a VentiIating Pows.
The increase in heat is tie greatest
]
properly utilized. As you can see by
these figures quoted, the WARM air is
so much lighter than the cold air Like
a balloon in the air or a cork I'm water;
the cold air is so much heavier that
II PUSHES down and takes the place Of
the warm air. forcing the latter out. You
must remember however, that a current
OF air is affected by friction, just as wa
ter is. As an illustration. there Is
statement i'm the Bible where il says it
Is easier for camel to so through the
eye Of a needle than 1t is for rich
man to enter the kingdom of heaven, and
eVeryb body is trying TO put that camel
through the eye of chat needle. which
would be all right if they would first
enlarge the eye of the needle. l am
using this as an Illustration Of the fric-
ton OF air. Friction increases with We
lOctty. By one system of ventilation you
can prevent 50 per cent of the gases from
escaping out OF the stratas OF the earth.
except as you work the ore out. Under
another plan you release these gases of
the earth. The extra percentage of gases
mixing with the air of a mine increases
its volume, thus increasing the friction
OF the air current and these gases may
become too prevalent, even TO the eX-
tent, at times, of blocking your Venti-
latns system. and the deeper you so
the more poisonous and noXious gases you
must expect"
What do you think of compressed air
rs a ventiia.ir~ -~edium2'
1t is a known fact that compressed
air loses Il percentage of its oxygen.
When tie air that has been compressed
Is again expanded to its original volume
IL IS poorer in oxygen.
1t reminds ne of a man feeding an
elephant with d spoon. After awhile the
animal would become so weak that he
could not move his trunk. So il is with
a RAN fed alone with such air. Com
pressed air is fed through a pipe of small
dimensions, and after it leaves that pipe
specific gravity projects it 10 the floor.
To illustrate the point let US substitute
water for air. Take an inch pipe on
floor ten or thirty feet wide and see hew
slowly and to what little deDth The wa
ter covers the floor. So with cold air.
it hos a sDecific Gravity and would be
distributed the sa-ee as, Trater ,.nder Ike
conditions. So / hardly take into con-
sideTation compressed air as a means of
ventilation, for yOu INST have sufficient
current of air TO carry awav noXiOus
gases. 9owder smoke a2d other impuri-
ties
More Shafts Necessary.
DO you believe that the ventilation of