You have to make the clocks strike midnight at the same time, then you will get a lantern. You can fill it up at the kerosene barrel in the basement (next to the steps).
In Detail
In the third floor bedroom (left) there are two clocks on the mantelpiece. They are spinning separately, and every time one of them hits midnight (both hands straight up), a skeleton springs out. According to the ghostly telephone in the room, the "light" will be revealed when the two clocks strike midnight at the SAME time.
("Darkness fills the grave. Find our light when midnight strikes twice.")
To get this to happen, you have to speed up one of the clocks by clicking on it, and then (if the midnights don't happen at about the same time) click on the other to speed it up. The problem is that the clocks continue to spin faster for awhile after you click, so timing the midnights is difficult. The best chance for success is to let one spin slowly, and when it gets close enough to 12 midnight, race the other one to catch it.
This is time-consuming but eventually the clocks hit 12 closely enough and they stop, revealing the LANTERN in the fireplace below. (Although you have the lantern, you still need to go to the basement to add kerosene to it.)
---
The clocks must both strike "midnight" (both hands up, 12 o'clock) at the same time, so that the skulls pop up at nearly exactly the same time.
The closer the cursor is to either of the clocks, the faster it goes. Time the spinning hands by speeding up one or both clocks. When they cross twelve o'clock at the same time, the Lantern will appear in the fireplace.
"Sync" is short for "synchronize" (run at the same time), which nobody wants to spell out. This applies to the twin clocks in Poptropica's Haunted House. To "synchronize" is to get them running together, which is not actually the solution. Both clocks have to strike midnight (skulls pop up) at almost exactly the same time, which is difficult to do.(see the related question)
set them at the same time
It is red... like your average lantern.... you have to play with the clocks to get it though... look up "Haunted House Poptropica Walk-through if you want to know how to beat the clocks.
u click on the clocks until they both are at 12 o'clock
In the third floor bedroom (left). Click the clocks above the fireplace.
you get it when both clocks strike midnight at the same time.
no
The clocks are in the bedroom, third floor left, on the mantle above the fireplace. (see the related question)
u have to make make theskeleton face again
It is on the third story of the Haunted House, in the fireplace. (You need to align the clocks on top of the fireplace so they will meet at midnight.)
in the haunted house in the bedroom the 2 clocks click on them and when they hit 12'00 both skulls will pop out at nearly the same time then in the fire place the lantern will pop up
You still need the other 3 treasures: - the draught from the basement - the chalice from the attic - the lantern from the clocks in the bedroom