Wardle Prismalux Lantern Installations

The Prismalux bulkhead by Wardle was a small light for tungsten lamps. They featured a thick, octagonal glass refractor lens which sat within a cast-iron body. Within the bulkhead was nothing more than a lamp-holder and a small reflective white plate. They could have angled or non-angled bodies depending on the application they were needed for.

Stoke-on-Trent

This one is positioned underneath a doorway on Station Road, Stoke-on-Trent. The body is heavily corroded, and if it isn't able to be opened I'd guess it is disused.