"Ocean Steamship and Ocean Mail" is a publication presenting Thomas Rainey's research on the role of steamships in the development of world communications in the 19th century. The author follows an interdisciplinary approach, combining history, engineering and economics to reveal the importance of ocean routes for trade and connections between continents. The book helps the reader to better understand the impact of steamships on the social and economic development of mankind, and also opens new horizons for further research in this field.