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acetylene bicycle lamp

The container at the top holds water, and that at the bottom holds calcium carbide powder. A tap is turned to allow water to drip onto the powder, producing acetylene gas, which was burnt behind the glass cover.

It has a spring-loaded clamp to fix it to the bicycle to stop it shaking too much.

It is an 'Aceta' lamp,  made by Joseph Lucas Ltd of Birmingham after 1910 until about 1918.

This lamp was used during the black-out restrictions of World War I. All but a small part of the glass cover has been painted black to produce just enough light to see the road ahead, and to be seen.