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Instruments and Apparatus
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Safety Caps and Hats Safety caps and hats have been proven to be of
great value in mines, quarries and other industry. The upper pictured cap is a hard
material of great strength, offering tremendous resistance to fracture and is
non-conductive to electric current. Made of seamless one-piece shell, the bakelite
cap supplies time proved head protection. The protection derived from the use of the
safety cap, from the dangers of falling objects, blows and electrical current from trolley
wires cannot be under estimated. |
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Barometer A barometer is an instrument used to measure the pressure of
the atmosphere. The use of the barometer is a practical advantage, in the operation
of a mine, by showing the changes in the atmospheric pressure as they occur. A
careful study of these changes in pressure, in connection with the gaseous condition of
the mine workings, enables a more intelligent arrangement and control of the ventilation,
and will often forecast a dangerous gaseous condition existing in the mine, owing to a
rapid fall of the barometer.
Regular barometer readings, in connection with mining operations, are important in respect
their indicating the expansive effect produced on the mine air, which expansion always
accompanies a sudden fall of the barometer or decrease of atmospheric pressure. As a
result of this, the air and gases confined in large abandoned areas are forced out into
the live workings, causing the explosive condition of the mine air to be considerably
increased for a time. |
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Taylor Anemometer The form of Anemometer generally used in coal mining consists
of a metal ring within which is set a rotating propeller or blade. The air current
striking the inclined blades rotates the vane, the number of revolutions being recorded on
the face of the dial by means of a series of gears. The instrument is so calibrated
that each revolution of the vane corresponds to one lin. feet of air travel. The
instruments is employed to measure the velocity of the air current in mine airways as
expressed in feet. |
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Koehler Flame Safety Lamp |
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Methane Tester Type E-2
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Carbon Monoxide Indicator
A small highly efficient, four-cylinder radical hand operated
pump develops proper suction for sampling with little effort on the operator's part.
A built-in pressure regulator automatically maintains the correct sample flow,
which is indicated on a diaphragm-type pressure gauge.
The air sample first passes through a dehydrating canister which removes any moisture.
From the canister, it enters the cell containing a catalyst known as
"Hopcalite", and then passes through the pump and out the exhaust valves.
In the cell, carbon monoxide is oxidized to carbon dioxide by the catalytic action of the
"Hopcalite". Heat, liberated by this oxidation, is directly proportional
to the amount of carbon monoxide present, and is measured by differential thermocouples in
series with the indicating meter. |
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Self-Rescue Respirator Although the self-rescue does not supply oxygen it does
remove the hazard of carbon monoxide for half an hour or more, thus greatly increasing the
miner's chance of getting out alive. Self-Rescuers are as essential in mines as life
preservers on ships. |
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Gibbs Self-Contained Oxygen Breathing
Apparatus |
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Chemox Oxygen Breathing Apparatus The Chemox Oxygen Breathing Apparatus is a self-contained
breathing circuit operating independently of the outside air, employing a replaceable
canister containing a chemical which, upon contact with the moisture in the exhaled
breath, evolves a plentiful supply of oxygen for breathing requirements and absorbs the
exhaled carbon dioxide and moisture. Thus, Chemox affords complete respiratory
protection for the wearer in all oxygen-deficient or highly gaseous atmospheres. |
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