turbocharger

I have seen many references to BRISTOL AeroEngine experimental research into turbochargers but I have yet to find any comprehensive detail. Does anyone have any useful web-links to information on these experiments by BRISTOL? Thanks.

We all know the P39 and P40 never received a turbocharger making both of them a dog above 15,000 feet or so. The P35 was never a good performer, poor handling/turning ability and poor workmanship (leaking wing tanks). But the P35 got a turbocharger and became the P43 Lancer with good...