Sentence:  The <WSD>aerophore</WSD> consisted of two main components — an air-filled canister about the size and shape of a lawn mower engine, which the diver wore on his back, and a new creation, a "regulator," which automatically adjusted the pressure of the air in the tank to that of the water surrounding it. 
Meaning of the word marked with <WSD> tags:  A predecessor of the aqualung, invented by Benoit Rouquayrol and Auguste Denayrouze 1865