De Dondi's 'Astrarium', the world's first astronomical clock, 1364.

De Dondi's 'Astrarium', the world's first astronomical clock, 1364.

Plan of the Principal Triangulation of Britain, 1787-1790.

Duchess section drawing

General Site Plan for the Sennar Dam, Sudan, 1925.

Woman calling to an elderly man asleep in a deckchair, 1953.

Man gardening as a woman looks on from a window, 1953.

Sir John Brocklebank (left) discuses Q4 plans with colleagues, 21 January 1964.

Sir John Brocklebank (left) discuses Q4 plans with colleagues, 21 January 1964.

Artist impresion of a Mars Base, 1970.

Government of India Class O metre gauge 4-4-0 1886.

Bogie tender for NZGR 4-6-0 (E1173) 1900.