4) Two one million candlepower lamps pointing downwards at an angle to estimate height above the forest canopy, using a similar principle to that adopted for night flying during the 617 Squadron Dams raids in World War 2 and developed by Barnes Wallis (for whom the machine was named),
moth | Enigma machine | Rage Against the Machine | Barnes & Noble | Automated teller machine | Jimmy Barnes | Victor Talking Machine Company | John Barnes | Soft Machine | John Wallis | Barnes Wallis | Barnes | Wallis Simpson | The Time Machine | Roy Barnes | Linotype machine | Julian Barnes | Vickers machine gun | John Barnes (footballer) | DeLorean time machine | Darne machine gun | Rube Goldberg machine | MG 17 machine gun | Barnes, London | The Wolseley Sheep Shearing Machine Company | Machine Head (band) | Machine Head | KPV heavy machine gun | Dave Barnes | Barnes Foundation |