Aluminium bulkhead for the International Space Station, USA, October 1997.

Single railway line, with men working in the distance.

Single action pumping engine, Watt model.

Adams 'Minex' single lens reflex camera, c 1910.

Adams 'Minex' single lens reflex camera, c 1910.

First (single or polyphase) AC Commutator, 1887.

Winter's single-needle telegraphic block instrument, 1880-1885.

Winter's single-needle telegraphic block instrument, 1880-1885.

Model beam engine, 19th century.

'Super Scotrail Offer - Bargain Single to

Vauxhall racing car, 1910.

Klein bottle, 1995.