Roy Bowdler:
My Fowlers Electrical Engineer’s Pocket Book 1946 (effectively pre-war) cites as its source of illustrations and wiring diagrams for lighting, AP Lundberg and Sons Ltd of London. The illustrations seems to show two pin sockets an plugs. Presumably allowing light fittings both on stands and ceiling suspended to be moved around from room to room
I'm well aware that bayonet cap plugs existed to enable portable appliances to be powered from the lampholder of a ceiling light back when wall sockets were scarce, but I have not seen two pin sockets on ceilings. In some old houses 2A wall sockets were installed that were connected to the lighting circuit.
Roy Bowdler:
My Fowlers Electrical Engineer’s Pocket Book 1946 (effectively pre-war) cites as its source of illustrations and wiring diagrams for lighting, AP Lundberg and Sons Ltd of London. The illustrations seems to show two pin sockets an plugs. Presumably allowing light fittings both on stands and ceiling suspended to be moved around from room to room
I'm well aware that bayonet cap plugs existed to enable portable appliances to be powered from the lampholder of a ceiling light back when wall sockets were scarce, but I have not seen two pin sockets on ceilings. In some old houses 2A wall sockets were installed that were connected to the lighting circuit.
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