Messages Being Picked up at Hendon
MESSAGES BEING PICKED UP by aircraft of No. 4 Army Cooperation Squadron. The messages are attached to lines strung between uprights on the ground, and the lines are picked up by hooks on the ends of struts lowered from the aircraft. The struts can be pulled up and the messages retrieved by the observers whiles the aircraft are in flight.
The Parnall Monoplane
FOR STUDYING AIRFLOW over the wings of an aircraft at different speeds and different attitudes, this Parnall monoplane was provided with tufts of wool on the main plane. A cinematograph camera on the tail of the aeroplane photographed the movements of the wool tufts. The films could then be studied at leisure in relation to the speed of the aircraft and the position of its controls.