A doctor in Cleveland used high-pressure chambers that resembled Pullman train cars to treat a host of diseases with oxygen therapy in the early 1900s, claiming miraculous results. Al Wilson's version of the apparatus almost 90 years later operates out of a trailer parked outside a hotel in Somerset County. Twirling control knobs for pressurization of a steel tank similar to a large, tubular diving bell, Wilson has for the past five weeks treated patients, mostly children with brain disorders, to a breath of fresh oxygen that improves the symptoms of their conditions -- at least in the eyes of...