The book "Report on the Useful Discovery of Doubling the Ordinary Quantity of Sea Water by Blowing Streams of Air through the Evaporating Product, and of the Great Use of Fans in Many Cases for the Preservation of Health and Lives" by Stephen Hales is a scientific treatise that explores the possibilities of optimizing processes purification of sea water and improvement of conditions for preserving health and life of people. The book describes in detail a method of doubling the amount of purified seawater by introducing streams of air during distillation. The author reveals the principles of this process and discusses its practical application to ensure continuous access to fresh water in conditions where this resource is limited. In addition, the book provides an overview of the extensive use of ventilators in various cases to maintain health and save lives. The author examines the impact of ventilation on air quality, breathing processes, and general health, and also considers various areas of ventilator use to prevent disease and improve quality of life. This book will be a valuable source of information for scientists, engineers, doctors, and anyone interested in improving water treatment technologies and protecting people's health.