Tomb of the Lamplighter - First Rotating Gear Puzzle

Lara Croft and the Temple of Osiris screenshot
Shoot the switch so the green side faces you and the huge gear on the left is turning clockwise.

Lara Croft and the Temple of Osiris screenshot
Jump onto the block in the pool and use your torch to light one of the gas vents on the gear.

Lara Croft and the Temple of Osiris screenshot
Wait for the gear to turn, lighting the gas vent in the corner between the two gears.

Lara Croft and the Temple of Osiris screenshot
Then shoot the switch again to change the direction of both gears. Now the gear on the right moves clockwise, carrying the fire from the vent in the corner to the gas vent on the right.

Lara Croft and the Temple of Osiris screenshot
Mission accomplished!

Lara Croft and the Temple of Osiris screenshot
The water in the pool begins to boil, raising a pillar so you can climb (carefully) onto the ledge above.

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