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CONTENTS

INTRODUCTORY

I. DESCRIPTION OF THE COLLIERY
General
Management
Safely lamps
The Low Main Seam

II. THE PLOUGH FACE
General description and method of work
Ventilation
Precautions against coal dust
Inspections before the explosion

III. THE EXPLOSIONS
Narrative of the first explosion
Rescue and recovery work (1)
Narrative of the second explosion
Rescue and recovery work (2)

IV. THE INVESTIGATION
Exploration of the affected area
Source of the firedamp
The means of ignition
Cause of the explosions

V. GENERAL OBSERVATIONS
Ventilation
Firedamp drainage
Stone dust barriers
Light alloys

VI. ACKNOWLEDGMENTS

APPENDIX A. — REPORT ON THE EXAMINATION OF THE PLOUGH FACE AND TESTS ON THE INCENDIVITY OF FRICTIONAL SPARKING POSSIBLE WITH CERTAIN PIECES OF EQUIPMENT

APPENDIX B. — REPORT ON THE OPERATION OF THE STONE-DUST BARRIER

PLAN No. 1 — SHOWING EXPLOSION AREA, LOW MAIN SEAM
PLAN No. 2 — SHOWING VENTILATION ARRANGEMENTS IN PLOUGH FACE, LOW MAIN SEAM