Here are a couple of very old battery lights for bicycles. The rear lights are about as simple as you can make – a spring holds the battery away from the bulb terminal until the body is screwed on far enough to compress it and make contact with the bulb. As the body is unscrewed the spring pushes the battery away from it to turn the light off.
The blue one is stamped “Eveready” “Made in England” and the black one looks like bakelite and is unmarked. Both are from my grandfather’s collection.
The headlamp / torches above are multi purpose, perhaps for army / boy scout / camping, fishing etc. uses. The black one is marked “Eveready” “Made in England” and has a fitting for a bicycle light bracket on the back.
To operate the Eveready, the knob screws down. The brass Kempthorne knob pushes down and twists to lock. The Eveready takes a battery size called No. 701A .
The brass one is dated “1944 Aust” – I believe it may be an army torch, it has a sort of large pocket clip on the back.