AERO‐ENGINE DEVELOPMENT Available to Purchase

THE principal feature of this month's issue is an extremely able paper covering a variety of aspects of the design and installation of aero‐engines by two members of the staff of MESSRS. ROLLS ROYCE. This paper was read last year at the World Automotive Engineering Congress of the Society of Automotive Engineers in New York and we are indebted to the Society and the authors for permission to reproduce it here. It constitutes, as is natural, to some extent a defence of the liquid—or, as the authors prefer to call it, the “indirectly”—cooled engine. In England this is, of course, hardly necessary since it has always been felt here that there is room for both types and that any advantages the one may have for some purposes is counter‐balanced by those of the other for different uses and it has consistently been the policy of the Air Ministry to encourage the development of both.