MINE GASES AND VENTILATION

TEXTBOOK FOR STUDENTS OF MINING, MINING
ENGINEERS AND CANDIDATES PREPARING
FOR MINING EXAMINATIONS

Designed for Working Out the Various Problems That
Arise in the Practice of Coal Mining, as They Relate
to the Safe and Efficient Operation of Mines

BY

JAMES T. BEARD, C.E., E.M.

SENIOR ASSOCIATE EDITOR, COAL AGE; FORMERLY PRINCIPAL SCHOOL OF MINES, INTER-
NATIONAL CORRESPONDENCE SCHOOLS, AND ASSOCIATE EDITOR MINES AND MINER-
ALS, SCRANTON, PA.; PROFESSOR OF CHEMISTRY, SCHOOL OF THE LACKAWANNA;
SECRETARY STATE BOARD OF MINE EXAMINERS, IOWA; MEMBER AMERICAN INSTITUTE
MINING ENGINEERS; INSTITUTION OF MINING ENGINEERS, ENGLAND; MINE INSPEC-
TORS' INSTITUTE OF AMERICA; FELLOW AMERICAN ASSOCIATION FOR THE ADVANCE-
MENT OF SCIENCE.

SECOND EDITION

REVISED AND ENLARGED

MCGRAW-HILL BOOK COMPANY, INC.

NEW YORK: 239 WEST 39TH STREET
LONDON: 6 & 8 BOUVERIE ST., E. C. 4