Coal Mining. E-book. Formato PDF T. C. Cantrill   -  Forgotten Books, 2017  - 

IN the following pages an attempt has been made to place before the general reader a slight sketch of the principles of Coal Mining. Not to take too narrow a view of the subject, in the earlier sections I have outlined the evolution of the industry from its primitive beginnings, and have indicated here and there some of the far-reaching effects it has had on domestic and mechanical affairs. I have also introduced such geological considerations as have a.