The West Virginian. [volume] (Fairmont, W. Va.) 1914-1974, 1922-02-11
Maps Distributed to Have
Proper Symbols Mark
edson Them
There last WEEK.
Attendance in Schools in
Northern West Vir-
ginia Favorable

Forty.one members attended the
Fatrmort mining extension school
al the FaFmont high school annex
last evening. Considering the in:
clement weather the large number
OF men o. members OF their fam.-
Hes sick and the effects Of mines
closing down the attendance was
fair Since the big plant of tho
New England Fuel and Transports.
ton company closed down the
members from Grant Town have
mot been as regular in attendance.
Every effort will be made with.
in the next few weeks to keep up
the attendance. It was formally
announced last evening that Prof.
Gallen. Morgantowns head Of the
department OF engineering at West
virginia university, will visit the
class on Friday evening, March Q.
He Is greatly pleased with the ex-
tension school work in Northern
west Virginia. Attendance figures
IL the schools in Northern West
virginia held up very well this
week there 4haying been III pres!
ent ia the five classes.
Last evening after the class had
completed the lesson maps were
distributed 10 the members to start
the work % marking a ventilation
map properly. Various symbols de-
note ovefcasts. doors, stoppIngs,
regulat ofs, brattics work and di.
tectioi1 Of air current. These will
be placed on the map at the proper
point so as to figure in the proper
control and distribution OF the all
current
Realizing the Importance of max.
ing correct calculations in deter.
mining the quantity OF air passing
IN an airway, the first part OF last
evening" lesson was devoted to
garioits shaped airways and fan
drifts. Assuming certain veloc.
~ OF air In the various shaped air.
Ways, the problem was to deter.
nine the quantity passing per min.
ute
The square shaped airway was
tile first TO be discussed followed
~ the rectangular, trapezoid, cir.
cniar and modification or each OF
these types, The square and the
rectangular entries are the most
common in the mine, and 1t is com,
paratiyelyf easy for tho average
mine foreman to find the area OIL
such an entry. Many mines open.
ed by q drift are timbered for quite
a distance extending back into the
mine In the form of a trapezold,
also many circular fan drifts are In
use In this state and shafts having
sent-c irctilar ends, as the mining
law OF this state requires the air
tosbe measured at the inlet and but.
Jet then in many cases It Is nee.
essary for the mine foreman to!
make such calculations as will en-
able him to determine the quantity
of air passing. Many problems were
worked TO Illustrate and show the
class how such determinations
were made.
The next step in the lesson was
TO determine the perimeter Of the
above shaped airways. many exam.
pies were solved for the benefit
q the class. The perimeter OF an
entry was defined as the sum Of all
the sides, that Is the distance
ground the outer boundary Of a
figure or the entry.
Reasons for determining the per.
imeter Of an entry included:
no calculate the rubbing sur.
lace that an entry offers to the
passage Of an air current.
twas explained to. the class that
the air In passing through the mine
aifways must rub against the top,
bottom and sides Of the airway,
50 that the total rubbing surface
must be equal to the airway times
the pertmeter, The Importance OF
knowing the rubbing surface will
he brought out In a later lesson.
m reference to last weeks les.
son on natural ventilation. An ar.
tice was read about disaster
that occurred In a coal mine in tha
state Of Colorado December 49,,
1891 This mine depended on nut.
lfai Ventilation for its circulation.
a small fire from spontaneous com.
btistion started In one OF the work.
"a out portions Of the mine. OnI
his parti ocular Jay the superintenu.
silt with some men went under.
sropnd 70 build some stoppings in
1rder To- seal the fire area. These
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