Why did ancient lamps have that shape?

It is shaped like a shoe with a handle in the rear, the add fuel hole in the middle and the wick in the front.
Why did they have this long shape?
Like the one Aladdin rubbed.
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I've always guessed that it was to keep the flame at a distance from the pool of oil in the filler hole, so it wouldn't ignite the whole pool.
But that's just a guess.
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Ed Huntress

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