Book about stirling engines and their history. This compact little book provides a good general overview of Stirling Engine design and operation. It provides many illustrations which both explain the operation and provide examples of practical Stirling Engines. Dr. Senft also included a very brief description of the thermodynamic principles of these engines which includes an explaination of Carnot Efficiency. This book is in great condition, with minimal shelf wear. It almost looks just like new. Great book, extremely informative. I used it when building my own miniature stirling engine.