Coughtrie SY10 Lantern Installations
The SY10 by Coughtrie was a common aluminium and glass bulkhead light. It was intended for GLS lamps, as it was too small to fit anything else inside. Access to change the lamp was gained via two screws on the front cover; the glass and cover would come off and expose the lamp-holder and wiring.
Long Eaton
All Saint's Church in Long Eaton has one of these bulkheads installed on the rear side of the building. It is operated from within the church itself.