The evening herald. [volume] (Shenandoah, Pa.) 1891-1966, 1897-06-29

Describe in q general way how you would
ventilate the above coliery, and show where
you would place the ventilators or fans, and
how you would apply them so as to produce
the best results2
State how the flow of air through mine
is effected by friction?
Give the plan or system Of ventilation
adopted in some mine in which you have
worked; and state the difficulties that may
be encountered when final robbing takes
place. to maintain the ventilatiou2
What are the requirements of the law re
garding measuring and reporting the yentila-
tion, and how can the air currents be meas
ured?
What quantity of air is passing through an
arway having a collar feet 6 inches be-
tween uotches, 9 feet spread aud 6@ feet high;
when its velocity is 1925 feet per minute?
In "a mine employing 325 men, what
amount of air is required, and what would
be the area of airway if the velocity were 45o
feet per minute?
Name the gases generally found in Anthra-
cite coal mines which are dangerous to life,
where you would look for them and how can
they be detected, give their several peculiari-
ties and their different effect on the human
system
can he irst detected in a salty lamp, also the
proportion when it explodes most violently ?
Explain the principle and construction of
the safety lamp. Name some Of the best
safety lamps for great volocties
What are the disadvantages in having the
air travel at a high velocity. Explain fully :?
What instruments are necessary for a Mine
Foreman, and for what purpose does he use
them?
If $4,000 cubic feet of air produced with
water gauge of 40 inches, what quantity
will be produced If the water guage is in
creased to 2 inches
The amount of air produced by fan is
! 11050O cubic feet per minute, the water
| gauge is inches. What is the horse power
/ producing ventilation?
fan running 60 revolutions per minute
| gives pressure of $40 pounds per square
foot If the speed of the fan is increased to
So revolutions what will the water gauge be {?
When %, 600 cubic feet Of air is passing
through a mine with pressure of pounds
per square foot. What will be the pressure
if the quantity is increased to $4,000 cubic
feet per minute?
What causes natural ventilation, also ex-
plain the various means by which mine ven
tilation may be produced?
Explain the theory of the ventiating fan
used in the Anthracite region. Why and
how does it create a current throughout the
mine2
Which is the most effective, the exhaust or
the forcing fan. The closed or the open fan,
give reasons?
What are the conditions which should be
taken into consideration in determining the
width and breast of pillars. Should they be
of equal width under all circumstances. Give
reasons?
What size timber would you recommend
in gangway in which collar 81 feet between
notches is used And what size would you
use in making a turnout in which collar 10
feet long between notches is used in a vein 80
feet thick and pitching As degrees, both gang
way and turnout being along the bottom slate
of the vein?
In what proportion will the strength of
props supporting the roof of a foot vein re
quire to be increased when the vein is l2 feet
thick the character of the roof being the
same
| In sinkinga double track slope on the Mann
moth Vein dipping As degrees and having a
bad bottom what method Of timberinp
/ would you adopt and on what angle would
| you stand the timberl
]
| pitching 45 degrees. Hosting two cars at on,
time, each car with its load weighing tons
What size rope of either iron or steel wOuld
in your opinion be suitable for hosting two
cars at one time on the above slope2
What is the pressure per square inch at the
bottom of pump column full Of water, in a
slope 500 feet long, pitching As degrees2
Give the diameter of plunger length Of
stroke and number Of strokes per minute
necessary to pump one million gallons o
water in "a hours2
What would be the diameter Of each Of foul
plungers 20 equal the capacity Of 10 incl
/ plunger?
/ If the barometer falls from 80 inches to 20}
inches, what is the difference Of pressure pei
square inch?
Explain how mine workings are plotted on
/ the maps and on what scale. What would be
| the length shown on a map Of a gangway
one mile long, and what should the length o.
a breast be plotted that has been worked M
80 yards on pitch Of go degrees
What are the principal causes Of fires il
coal mines. And what are the best precau
tions that can be taken to prevent them?
What SHOULD be your first consideration IN
case Of fire occurring at the inlet and wher,
the smoke may be conveyed to the workmen'
When driving towards old workings which
could not be examined, what precautionary
measures would you adopt
Suppose you were approaching an abaud
oued mine filed with water TO vertica
height of 800 feot vein 30 feet thick and Goa
. free pitching so degrees. How much pillal
would you leave to prevent the water from
bursting in, both mines being on the same
/ level2
What are the provisions Of the mine Law
relating to doors. What are their purpos,
and how should they be erected
State what in your opinion could be done
| 10 diminish accidents in the minesY
| What would be the total pressure on dam
| % feet wide aud ~ feet high with a head oil
/ water Of l75 feetY
| What should be the qualifications Of Mine
Foreman so rs to fully fit him for the posi-
/ tiOn2