Sentence:  The <WSD>aerophore</WSD>, a new life-saving apparatus, is at present attracting much attention. It is specially designed to enable the workman or miner to enter a mine full of fire-damp, and to labor there with complete immunity from danger. 
Meaning of the word marked with <WSD> tags:  A nineteenth-century device with breathing tubes used by miners and workmen in areas that contain toxic fumes.