INVENTORS
Content
Introduction
A Brief Background of Regulation of and Illumination in Mines
Background of Henry Rees Davies
Improvements to Miners Safely Lamps
General
Account of Materials Bought
Events Relating to the Improvements
Royalties
Miscellaneous
Intrinsicaly Safe (Sparkless) Electrical Signalling Relay
Definition of Intrinsic Safety
Background
Events Relating to the Relay
Royalties
Reports on the Dangers of Electrically Operated Signalling in Mines
Photo Archive
Acetylene Gas Generator
