13509-13513, ca. 1892

              13503
,;   jo ici'l ■:'■■',.: ol   •} o methedis ernloyed in laying   -, .   .•< 11
1 ■    firinj    ho shot's in    wtlo     ito mi ...
Phera is a .   llveraity ol opl ilos smoni   1 iniug
- ..'   r' Aa.     ..  • ,  ■' :■   -art   **.Sj id by   kjaI   lv at  L.i colliery
a   alosions.    5c a ; o*a. -.* at ooal dust in the absence oi
fire-d'>mp in   1 ploaive,   ihilo ot3  ira    ii .tain   hat eoal
v-t 'n the abse:.oe o£ fire-dam** in oomnax-atively harr.loao.
ilearly  all agree  that it ia   a^ploaiva   rith    tuantltioa ...
flre-dame that would be harmless and nono*ploslve ix   tl .
oo-.-.   tuat wex'o no., eroaeut.    Vari rus plana hava **oen tried,
Lurlnf   the la-.t six years to ia,> the u at of ooal mines,
tn "3-c cane* nlpon have heoa "aid along tl •■ galleries ox
.: ; mino, and oocks, to whioh a hose oouid "o attaciod,
wore olaced at regular dlstanee   apart,    --y  thia means tho
roof and sides cmiu/o  "' 0l"CH'-} 1-  washed.      ifforta were
then trio.', wit*- WWPinci,  perforated so   ia   .0 a"low ex
.'. e eacane of ..T e enolosed  rater 1-. '■*■ fine spray,    cite 0' j-
octioi. .3 thia method waathe liability ox water to collect
i.i the vicinity  w  the saNso. pines,  and in minea haviug xirt-
olay floor- thia water had a tendency  to  aauss the floors
to heave.     Che offset of  -aaninc sompresaed a~l-  through Uto
•rater pi pea baa been tried, and reported on favorably,   io.«-
ever, as very few mines have   1. air coi ireaainc   slant,  this
rould prove, in most oaees,  too a*,peiiBive for general UEiorv-
tion.   Another aorlouS objection to thia ay   uei   .- aa follows 1   no air when undergoing compression gives out its latitat heat,  and   .-Ten it   ,ac.i^o-. again,  it ranidly   tbaorba
*oat from the Burroundlng air, and thereby reduces the temperature in ita vloini /   oonsfterably below freezing *x>ixit,
m may ' •.- seen "y  t) .-■ x'oi*ma-.ion of ico around  he exhaust
oi •..   ii - ooriPssHrair ani L ...     Pho .-  ti lt 0.   this cooling
effect on the air ia to bring tho temperati ro of t] a air-
lurrem   tomporarily, lower and   isaror t) . ae 1 point for the
moisture it already hae absorbed.
Thia will simply prevent tho air froi -.--:■:!... 1. ■ tl 1 Quantity ox' water that t] tamneraturo of .hat nart o. the - i..e
proporli oaiia for, ao that, rh.enevor .) .. sir-current I is
na.asod tie "aat apray, it ia still greedy fox- water, rod
-,o satisfy ita deraont -, 1 . .1" torba fhat ma* live JS0*^-^**
okled o. the galleries to lay .: a dust. Phia e-.a^i^Vf-haid
'-  leeired to *o accomplished by  thoasproyi.
Attempt-, to counteract thia action of   -To air-current,   is
von as to help to ratain tl 1 1 oiature in tho cool -..i st,
I »ve been trie    by   .;-.- use of hygroaoopio or doliouesoent
Bu**stoncea, sue*   as rook salt, oalclum ohloride, ate,     Pho
amoi it of reek salt whioh laa been lound neoesaary for tha
• aJ   talnonoe of tl    dust i.. a sufficiently moist 0—Lition
to oreeent it- flying,   .aa near!.,  -.!.•_; i*.a   -..r square foot
i.    1 .•, too,   —■-"..   1   : "..    tn as   1.  .enslve mine,   ii itant
from   talt   iroduoa" ■/.   ilstrieta,, this   wuld '-   in item ox eo..
rabl    ii "ortance   .0   ho •■-.#. .e operator,   ind *.   tha ioot
.'at   A: eaa substance    arc no . of any  use in 1 ins    ol 1 '■:'
• terature,    " ...-   mi it " . » point  f. ..    * 3 power j.   .; -
air  .0 retain Ita 1 ■/■ ■ ,x re - tor   hau t: . -   rer ax
■■ 11  ■ntion of    "    dell - isoo .'. salt to attract   .' 0 *rater
.. --v    '.'      ilr.     .'       Lotun ine ,io > 01    -T .   . m- -... itt re   in