Fig. 2. Side-by-side diagrams of Hayes Anaesthetic Apparatus Nos. 1, 2, and 3. (  A ) Hayes Apparatus No. 1. (  B ) Hayes Apparatus No. 2. (  C ) Hayes Apparatus No. 3. * An optional “adjustable hanger” of weights and “pulleys with screw attached” and “secured to the ceiling.”** Double stopcock for attaching Hayes Apparatus for Oxygenating the Air. The Rev. Dr. S.J. Hayes preached that a proper “Hayes Anesthetic Apparatus” always consisted of an “air-forcing” foot-bellows as an “Aerator” connected by rubber tubing to a “Generator” (vaporizer). Either a mouth piece or, as illustrated, a double-funneled “face piece” could connect his apparatus to the patient.