My own preference is for waste to be disposed of, as far as is practicable, as soon as it becomes available ; an engine that warms up quickly but never overheats. This requires either blower air-cooling, which is admittedly not easy to achieve quietly and without power loss, or a large radiator with fan and really capable thermostat. I have yet to encounter a standard thermostat that is large enough to cope, as it should, with unlimited cooling capacity, but it is quite easy to arrange. Fan power-loss at really high revs. could be avoided by a centrifugal deelutcher cutting-out the fan at, say, 4,000 r.p.m.

I am, Yours, etc. Bebington. J. R. etc.,