What fuel powered the Ford Model T's headlights before electric lighting?

What fuel powered the Ford Model T’s headlights before electric lighting? Acetylene gas powered them.

Early Model Ts used carbide, or acetylene, lamps rather than electrical headlights. Water dripped onto calcium carbide in a small generator, producing acetylene gas that was fed through tubes to burners in the headlamps. The gas flame was then lit manually.

Acetylene was practical for early motoring because its bright flame remained comparatively resistant to wind and rain. Reflectors and magnifying lenses helped project the light forward, although the system required maintenance, refilling, and careful lighting.

A common mix-up is “oil,” because early vehicles often used oil lamps for other lights, including tail lamps. Ford replaced the Model T’s carbide headlights with electric headlights in 1915, after its magneto system was upgraded to provide enough power for lighting and the horn.