Conversation on Mines, Etc: Between a Father and Son; To Which Are Added Questions and Answers to Assist Candidates to Obtain Certificates for the Management of Collieries, a Lecture on the Atmosphere and Explosive Gases, Tables of Calculations, Rules of

Excerpt from Conversation on Mines, Etc: Between a Father and Son; To Which Are Added Questions and Answers to Assist Candidates to Obtain Certificates for the Management of Collieries, a Lecture on the Atmosphere and Explosive Gases, Tables of Calculations, Rules of Measurements, Etc., Etc

Son As you have been in mines, father, from early life, and your ancestors have had, during generations past, a practical knowledge of them, I shall be glad, when convenient, to have a little conversation with you on mines. - Father If I can give information by which you and the public may profit, I shall have great pleasure in so doing; and as we have a little leisure just now I shall be glad to answer, to the best of my abilities, any question you require information on respecting mines and mining.

Son Very good: then I wish to know, father, if carbonic acid gas, which miners call black-damp, and the gas left in mines after an explosion, be one and the same - Father: No. Gas left after an explosion is called after-damp or choke-damp, and is much lighter than black-damp, or even common air. This gas will make its way up to the roof, while black-damp will lie near the floor. Carbonic acid gas is a combination of carbon and oxygen. It was formerly called fixed air, on account of its being found in chalk, limestone, magnesia, etc.

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