This folder contains correspondence and other documents relating to Edison's development of a breathing mask for fire fighting on battleships. Included is a detailed description of the apparatus and its chemical components. The correspondents include Frank T. Fowler of the Life Saving Devices Co., supplier of the rubber mask and hose, and Edwin Smith, Jr., an experimental engineer working for Edison.

All of the documents have been selected except for a few routine letters pertaining to shipments and some printed publicity material.