Enjoy unlimited access: just £1 for 12 weeks

Subscribe now

he bespoke design, which appears to have been created for an attic room, allowed the lenses to jut out of the dormer window beyond the walls of the house.

An incised plate mounted on the housing dates them to 1946, with the maker of the internal metal works and lenses listed as Albert Lambourne of Poynings, Sussex, while the plate also carries the legend "William Pacey did the wood".

Estimated at £300-500, the contraption will appear in the July 19 sale.

Contact: 01285 646050.