Major William Barker in a Sopwith Camel, 1917.

Major William Barker in a Sopwith Camel, 1917.

Aeroplane starting on reconnaissance. July 1916.

Aeroplane starting on reconnaissance. July 1916.

Gondola - from which bombs were dropped.., 1916 (c).

Gondola – from which bombs were dropped.., 1916 (c).

Anti aircraft machine gun July 1916.

Anti aircraft machine gun July 1916.

A downed Zeppelin still smouldering, 1916 (c).

A downed Zeppelin still smouldering, 1916 (c).

An aircraft ready for take-off, 1916-1918.

An aircraft ready for take-off, 1916-1918.

The well camouflaged spotter of enemy batteries', 1917 (c).

The well camouflaged spotter of enemy batteries’, 1917 (c).

An observation balloon, 1917 (c).

An observation balloon, 1917 (c).

A biplane preparing to take off

A biplane preparing to take off

Sopwith Camel.

Sopwith Camel.

The Eyes of the Army, 1917 (c).

The Eyes of the Army, 1917 (c).

The R.F.C. 1917.

The R.F.C. 1917.

Over the German Lines.

Over the German Lines.

A squadron of giant planes, nd.

A squadron of giant planes, nd.

On the eve of a great battle, nd.

On the eve of a great battle, nd.

A Hun airman with a good war record.

A Hun airman with a good war record.

A Royal Aircraft Factory RE8 reconnaisance aircraft.

A Royal Aircraft Factory RE8 reconnaisance aircraft.

A Royal Aircraft Factory RE8 reconnaisance aircraft.

A Royal Aircraft Factory RE8 reconnaisance aircraft.

A Royal Aircraft Factory RE8 reconnaisance aircraft - close up.

A Royal Aircraft Factory RE8 reconnaisance aircraft – close up.

A squadron of giant planes, nd.

A squadron of giant planes, nd.

On the eve of a great battle, nd.

On the eve of a great battle, nd.

An intrepid observer meets with a mishap, 1916 (c).

An intrepid observer meets with a mishap, 1916 (c).

An observation balloon in flames, falling to the earth. D2570.

An observation balloon in flames, falling to the earth. D2570.