Testing Aerofoils in free flight: Photograph shows the model aerofoil suspended below a Curtiss aeroplane in which the balance is mounted.

THE D.H.34: Front view. Note petrol tanks under top plane.

THE D.H.34: Three-quarter front view.

THE D.H.34: View inside cabin, looking aft.

The D.H.34: Some details of the very substantial tail skid. This is of the steerable type, and consequently the point of attachment of the rubber shock absorbers swivels with the skid. The shoe is of cast iron, and is easily renewable.

The D.H.34: The sketch on the left shows the folding platform and engine starting handle, and also the ladder leading up to the pilot's cockpit. On the right is the muff around the exhaust pipe from which the cabin is heated. Note the swivelling bracket, which allows the exhaust pipe to expand.

The D.H.34: Some details at the root of the lower plane.

The D.H.34: Some details of the ailerons control system. In the top left-hand corner may be seen the small crank arm, working on ball bearings, which is operated from the control stick via rods and chain. The aileron strut is adjustable for length.

The D.H.34: Sketch showing door of cabin, and folding ladder by means of which passengers enter. Inset shows the small spring clip which locks ladder in position when folded.

The D.H.34: Sketch showing details of the trolley used for supporting the tail when wheeling the machine about on the ground. The ball on the stern post rests in the socket on the trolley, where it is locked in position.

A SUPERMARINE SINGLE-SEATER FIGHTING SCOUT AMPHIBIAN: Three illustrations of the "Sea King, Mark I," fitted with 300 h.p. Hispano-Suiza engine. This machine is capable of all the usual tricks of a land aeroplane, being capable of being looped, rolled, spun, etc.

The Huff-Daland H.D.9A Biplane: Three-quarter front view of the 100 h.p. Anzani model.

The Huff-Daland H.D.8A Biplane: Two views showing the novel fuselage construction.

THE HUFF-DALAND H.D.8A BIPLANE: General arrangement drawings.

THE D.H.14 DAY-BOMBER ROLLS-ROYCE "CONDOR" ENGINE: The machine paid a visit to Croydon on the day of the Air Conference.

The Huff-Daland H.D.4B Biplane: Another type, the forerunner of the H.D.8A and H.D.9A, used for training purposes.

THE CURTISS C.T. TWIN-ENGINED TORPEDO SEAPLANE: Three-quarter front view showing how the tail is carried by outrigger tail booms.

THE CURTISS C.T. TWIN-ENGINED TORPEDO SEAPLANE: A cantilever monoplane with a large pontoon float under each engine; note the torpedo mounted below the central nacelle.