THE 504 AVRO.

I notice in the interesting article by Captain Stack in this month’s issue of “MOTOR SPORT” that mention is made of that old veteran, the 504 Avro machine. I venture to correct Captain Stack’s statement, however, that the engine originally installed was the Monosoupape 100 h.p.

If my memory serves me right, the first 504’s used in the Services (R.N.A.S. and R.F.C.) were powered with 80 h.p. Gnomes—the predecessors of the Monosoupape. In addition to the latter, the 130 h.p. Clerot, the 80 h.p. Le Rhone, and the 110 h.p. Le Rhone were also used. B.D. Surrey.