In this book, the first in a projected series, the author covers 'Bell-Crank' engines, where a Bell-Crank is the key component of the drive mechanism. The first two chapters of this book deal specifically with this mechanism, with chapter three covering Heating and Cooling, and chapter four providing a very useful guide to fault finding and trouble shooting. The six ‘Projects’ which follow describe, in detail, how to build increasingly sophisticated Stirling engines, all of which have Bell-Crank mechanisms. Full drawings, for metric and imperial dimensions are included, as well as numerous photographs of parts, machine set-ups and the like. This is a book which will appeal to anyone with an interest in the Stirling engine.