Ruston and Hornsby AP ( Agricultural Paraffin) Engine 6hp 

These engines were introduced in 1921 and remained in production until 1941.

They were produced in 5 sizes from 2 1/2hp to 10 1/2hp

Most were built as hopper cooled but a small number were supplied as tank cooled.

Early models had a LT magneto which was superseded by BTH H/T magneto's and finally by WICO EK trip magneto's.