Refined

Many a hapless pilot has crashed, died in flames ; many a plane burst afire in midair. Elmer Ambrose Sperry, famed inventor, of Brooklyn, N. Y., believes the fire menace mastered. His company has developed a Diesel airplane engine. Fuel oil for Diesel engines is non-inflammable.

Refinements on the familiar, far too heavy Diesel engine are reported by Mr. Sperry after years of research. The new motor weighs close to the lightest gasoline engine; is capable of delivering speed and horsepower comparable to good racing motors of the normal type. Experts read the news with deepest interest, hoping that widespread tests will confirm Mr. Sperry's belief that the new power plant meets every air requirement ; that by elimination of the fire hazard it will add an enormous safety factor to flying; particularly for commercial and passenger planes.