de Havilland Engine Company at Leavesden. Applications de Havilland Biplane No. 1 de Havilland Biplane No. 2 Government Balloon Factory Gamma Specifications (Iris) See also References Notes Bibliography Gough, Edward. A. The first D.H. engine. Flight, 27 July 1956. Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. . McKay, Stuart. The Moth - Magazine of the de Havilland Moth Club, No. 150. de Havilland Moth Club Ltd. Berkhamsted, Hertfordshire. June 2010. Iris 1900s aircraft piston engines Boxer engines