What is meant by boring for coal ?
Boring for coal is a method of finding whether coal seams exist in a locality. A long sharp steel chisel, worked by machinery, cuts through the layers of material. From …
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Boring for coal is a method of finding whether coal seams exist in a locality. A long sharp steel chisel, worked by machinery, cuts through the layers of material. From …
Wooden sheds, railings, posts and any structures which are to be exposed to the weather are usually covered with a coating of tar, because water and tar do not mix. …
Read more.Why do we use tar for protecting wooden fencing and posts placed in the ground ?
An ordinary lamp or candle cannot be used in a coal mine, as the flame would be liable to explode the “ fire damp.” In the miner’ s safety-lamp a …
Read more.Explain the principle of the miner’s safety-lamp.?
Peat has been formed in districts which were covered at one time by lakes. It consists of decayed vegetable matter. These lakes have dried up and left behind the great …
Lignite is a kind of coal found on the continent. It is composed of the remains of plants which grew at a later period than those from which ordinary coal …
The heat of the coal mine causes the coal to give off gas known as “ firedamp.’ ’ If this gas be mixed with air, and a naked light be …
Coals which contain a large amount of hydrocarbon or bituminous matter, generally give off thick clouds of smoke when burning. These kinds are used for burning in the house fire …
Read more.What Is anthracite coal;Why It is Most Useful Coal